diff --git a/src/GEOMImpl/GEOMImpl_ExportDriver.cxx b/src/GEOMImpl/GEOMImpl_ExportDriver.cxx
index 77d6acc32..190116ccb 100644
--- a/src/GEOMImpl/GEOMImpl_ExportDriver.cxx
+++ b/src/GEOMImpl/GEOMImpl_ExportDriver.cxx
@@ -111,7 +111,10 @@ Standard_Integer GEOMImpl_ExportDriver::Execute(TFunction_Logbook& log) const
   int res = fp( aShape, aFileName, aFormatName );
 
   // unload plugin library
-  UnLoadLib( anExportLib );
+  // commented by enk:
+  // the bug was occured: using ACIS Import/Export plugin
+  // UnLoadLib( anExportLib );
+  
   if ( res )
     log.SetTouched(Label()); 
 
diff --git a/src/GEOMImpl/GEOMImpl_ImportDriver.cxx b/src/GEOMImpl/GEOMImpl_ImportDriver.cxx
index b20706d1e..0d1480f85 100644
--- a/src/GEOMImpl/GEOMImpl_ImportDriver.cxx
+++ b/src/GEOMImpl/GEOMImpl_ImportDriver.cxx
@@ -106,7 +106,9 @@ Standard_Integer GEOMImpl_ImportDriver::Execute(TFunction_Logbook& log) const
   TopoDS_Shape aShape = fp( aFileName, aFormatName, anError );
 
   // unload plugin library
-  UnLoadLib( anImportLib );
+  // commented by enk:
+  // the bug was occured: using ACIS Import/Export plugin
+  //UnLoadLib( anImportLib );
 
   if ( aShape.IsNull() ) {
     StdFail_NotDone::Raise(anError.ToCString());