diff --git a/.github/workflows/full-mpich.yml b/.github/workflows/full-mpich.yml
index 40e27659d..a7d516b13 100644
--- a/.github/workflows/full-mpich.yml
+++ b/.github/workflows/full-mpich.yml
@@ -7,14 +7,18 @@ on:
       - develop
       - master
       - slegrand-actions-debug
-      
+
   pull_request:
     branches:
       - develop
 
   # For development phase
   workflow_dispatch:
-  
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linux:
     strategy:
@@ -27,7 +31,7 @@ jobs:
 
     name: Ubuntu ${{ matrix.version }} with ${{ matrix.cfg.opts }} \
             - ${{ github.workflow }}
-            
+
     runs-on: ubuntu-${{ matrix.version }}
 
     steps:
@@ -46,7 +50,7 @@ jobs:
           ./configure --enable-download ${{ matrix.cfg.opts }} \
           --prefix="${HOME}/freefem"
           ./3rdparty/getall -a -o PETSc
-        
+
       - name: PETSc
         run: |
           cd 3rdparty/ff-petsc
@@ -84,12 +88,12 @@ jobs:
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: MacOS ${{ matrix.version }} with ${{ matrix.cfg.opts }} \
       - ${{ github.workflow }}
-      
+
     runs-on: macos-${{ matrix.version }}
-      
+
     steps:
       - uses: actions/checkout@v4
 
@@ -123,7 +127,7 @@ jobs:
           ./configure --enable-download ${{ matrix.cfg.opts }} \
           --prefix="${HOME}/freefem"
           ./3rdparty/getall -a -o PETSc
-        
+
       - name: PETSc
         run: |
           cd 3rdparty/ff-petsc
diff --git a/.github/workflows/full-msmpi.yml b/.github/workflows/full-msmpi.yml
index 6f91bb5fc..5cf2e77ee 100644
--- a/.github/workflows/full-msmpi.yml
+++ b/.github/workflows/full-msmpi.yml
@@ -7,7 +7,7 @@ on:
       - develop
       - master
       - slegrand-actions-debug
-      
+
   pull_request:
     branches:
       - develop
@@ -15,6 +15,10 @@ on:
 # For development phase
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   windows:
     strategy:
@@ -23,7 +27,7 @@ jobs:
         cfg:
 #        - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: Windows Server 2022 with ${{ matrix.cfg.opts }} - ${{github.workflow}}
     runs-on: windows-2022
 
@@ -68,7 +72,7 @@ jobs:
         run: |
           pacman -R --noconfirm mingw-w64-x86_64-python mingw-w64-x86_64-gdb \
           mingw-w64-x86_64-gdb-multiarch
-          
+
       - uses: actions/checkout@v4
 
       - name: Configure
diff --git a/.github/workflows/full-openmpi.yml b/.github/workflows/full-openmpi.yml
index e652a6a51..4a40d3bb8 100644
--- a/.github/workflows/full-openmpi.yml
+++ b/.github/workflows/full-openmpi.yml
@@ -7,14 +7,18 @@ on:
       - develop
       - master
       - slegrand-actions-debug
-      
+
   pull_request:
     branches:
       - develop
 
   # For development phase
   workflow_dispatch:
-  
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linux:
     strategy:
@@ -27,7 +31,7 @@ jobs:
 
     name: Ubuntu ${{ matrix.version }} with ${{ matrix.cfg.opts }} \
             - ${{ github.workflow }}
-            
+
     runs-on: ubuntu-${{ matrix.version }}
 
     steps:
diff --git a/.github/workflows/minimal.yml b/.github/workflows/minimal.yml
index 598f6e85c..06e54d80f 100644
--- a/.github/workflows/minimal.yml
+++ b/.github/workflows/minimal.yml
@@ -1,18 +1,23 @@
 name: Minimal version
+
 on:
   push:
     branches:
       - develop
       - master
       - slegrand-actions-debug
-      
+
   pull_request:
     branches:
       - develop
-      
+
   # For development phase
   workflow_dispatch:
-  
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linux:
     strategy:
@@ -59,7 +64,7 @@ jobs:
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: MacOS ${{ matrix.version }} with ${{ matrix.cfg.opts }} - ${{ github.workflow }}
     runs-on: macos-${{ matrix.version }}
 
@@ -97,7 +102,7 @@ jobs:
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: Windows Server 2022 with ${{ matrix.cfg.opts }} - ${{ github.workflow }}
     runs-on: windows-2022
 
diff --git a/.github/workflows/sequential.yml b/.github/workflows/sequential.yml
index bcff564d8..f50b8701d 100644
--- a/.github/workflows/sequential.yml
+++ b/.github/workflows/sequential.yml
@@ -6,14 +6,18 @@ on:
       - develop
       - master
       - slegrand-actions-debug
-      
+
   pull_request:
     branches:
       - develop
 
   # For development phase
   workflow_dispatch:
-  
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linux:
     strategy:
@@ -62,7 +66,7 @@ jobs:
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: MacOS ${{ matrix.version }} with ${{ matrix.cfg.opts }} - ${{ github.worflow }}
     runs-on: macos-${{ matrix.version }}
 
@@ -99,7 +103,7 @@ jobs:
         cfg:
 #        - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
-        
+
     name: Windows Server 2022 with ${{ matrix.cfg.opts }} - ${{github.workflow}}
     runs-on: windows-2022
 
diff --git a/src/fflib/problem.cpp b/src/fflib/problem.cpp
old mode 100755
new mode 100644
index b0d59491a..b95ce9470
--- a/src/fflib/problem.cpp
+++ b/src/fflib/problem.cpp
@@ -10017,7 +10017,7 @@ bool AssembleVarForm(Stack stack,const MMesh & Th,const FESpace1 & Uh,const FESp
                             int ddf=K(df);
                             // AA(ddf,ddf) =tgv;
                             if (Aii)  onBC[ddf]='1'; ;//A->SetBC(ddf, tgv);// change 21 dec 2010 FH (Hack of ILU)
-                            if (B) (*B)[ddf]=  tgv1*gg[df];
+                            if (B) (*B)[ddf]=tgv1*gg[df];
                             if (X) (*X)[ddf]=gg[df];
                         }
                     }
diff --git a/src/fflib/problem.hpp b/src/fflib/problem.hpp
old mode 100755
new mode 100644
index 92e21521a..0833d7ae6
--- a/src/fflib/problem.hpp
+++ b/src/fflib/problem.hpp
@@ -27,6 +27,13 @@
  */
 #ifndef PROBLEM_HPP_
 #define PROBLEM_HPP_
+
+#include <limits>
+namespace FreeFempp {
+template<class R>
+class TypeVarForm;
+}
+
 extern Block *currentblock;
 
 template<class K> class Matrice_Creuse;
@@ -1379,11 +1386,38 @@ AnyType OpArraytoLinearForm<R,MMesh,v_fes>::Op::operator()(Stack stack)  const
      ffassert(px->N() == NbOfDF);
    }
   KN_<R>  xx( px ? *(KN_<R> *) px : GetAny<KN_<R> >((*x)(stack) ));
-  if(zero && NbOfDF )
-   xx=R();
+  KN<R> cc;
+    list<C_F0>::const_iterator ii,ib=l->largs.begin(),
+    ie=l->largs.end();
+    using namespace FreeFempp;
+    TypeVarForm<R> *tvf=FreeFempp::TypeVarForm<R>::Global;
+    assert( tvf);
+    bool ret = false;
+    for (ii=ib;ii != ie;ii++)
+    {
+        if (ii->left() == tvf->tBC) {
+            ret=true;
+            continue;
+        }
+    }
+  if(zero && NbOfDF)
+    xx=R();
+  else if(!zero && NbOfDF && ret) {
+    cc.resize(xx.n);
+    cc = xx;
+  }
 
-  if (  pVh && AssembleVarForm<R,MatriceCreuse<R>,MMesh,FESpaceT,FESpaceT>(stack,Vh.Th,Vh,Vh,false,0,&xx,l->largs) )
-    AssembleBC<R,MMesh,FESpaceT,FESpaceT>(stack,Vh.Th,Vh,Vh,false,0,&xx,0,l->largs,tgv);
+  if (  pVh && AssembleVarForm<R,MatriceCreuse<R>,MMesh,FESpaceT,FESpaceT>(stack,Vh.Th,Vh,Vh,false,0,&xx,l->largs) ) {
+    if (!zero && NbOfDF && ret) {
+      KN<R> bb(xx.n, std::numeric_limits<double>::lowest());
+      AssembleBC<R,MMesh,FESpaceT,FESpaceT>(stack,Vh.Th,Vh,Vh,false,0,&bb,0,l->largs,tgv);
+      for(int i = 0; i < xx.n; ++i)
+        if(bb[i] != std::numeric_limits<double>::lowest())
+          xx[i] = cc[i] + bb[i];
+    }
+    else
+      AssembleBC<R,MMesh,FESpaceT,FESpaceT>(stack,Vh.Th,Vh,Vh,false,0,&xx,0,l->largs,tgv);
+  }
   return SetAny<KN_<R> >(xx);
 }
 
diff --git a/src/lglib/mymain.cpp b/src/lglib/mymain.cpp
old mode 100755
new mode 100644