VS2013 Community/CUDA 6.5/Opencv CUDA stuck indefinitely

Ive successfully built OpenCV 3.0 Beta with CUDA 6.5-Support in MSVC 2013 Community Edition on Win7 64Bit (it shows no errors in MSVC).

My problem:
The attempted simple code (which uses cuda) compiles with no errors, to the point where i upload a Mat to the gpu and try to work on it with, for example cv::cuda::flip, but the graphic window stays black forever.
Because MSVC throws no problems or warnings, i really dont know how to solve this problem. Is there any method/program to analyse where CUDA gets stuck?

All include-files, libs and dlls are correctly located i assume (locally).

Any suggestions to solve the stuck CUDA-window?

Which GPU you use ? Cuda Toolkit 6.5 i think has some troubles with maxwell cards when using texture objects. Maybe the ‘flip’ function uses texture objects.
See
https://devtalk.nvidia.com/default/topic/814234/has-the-bug-of-cudacreatetextureobject-on-gtx-750-for-been-fixed-or-not-/
So if you have Maxwell card, it might be better to switch to Cuda Toolkit 7.
I think there is also an OpenCV forum where you can post your issue.
See http://code.opencv.org/projects/opencv/issues