Capture is a very uncomplicated and "light" program, which usually does not make any trouble. An uninstall and new install might clear the situation. It might also be helpful to not change the destination for files (use the path Capture suggests). If UC Control works and you can use UC Surface, the USB connection seems to be ok, so Capture should also run. I suppose you are using corresponding versions (firmware, software). Sometimes it can also help to just pull the USB connector our and in...
If a new install of Capture does not help, this is now a technical question and Support is there to answer hardware and software related technical questions.