Matlab 64bit mex compiling Issues

When using Matlab (R2009b 64bit on a Windows 7 64bit machine) with CULA R12 and matlab_cula.bat all runs smooth except if trying to compile mex-files.
The installed C++ Compiler is Visual Studio Express 9 w Windows 7 SDK and .NET FW 3.5.
When Matlab is started w/o CULA mex-File compilation works wo Problems, when starting Matlab w CULA and doing a mex-File compilation i'm getting this error:
??? Error using ==> mex at 221
Unable to complete successfully.
Any advise how to fix that is appreciated.
The installed C++ Compiler is Visual Studio Express 9 w Windows 7 SDK and .NET FW 3.5.
When Matlab is started w/o CULA mex-File compilation works wo Problems, when starting Matlab w CULA and doing a mex-File compilation i'm getting this error:
??? Error using ==> mex at 221
Unable to complete successfully.
Any advise how to fix that is appreciated.