im assuming morrowind crashes, not playclaw? , if its playclaw i may be due to a lack of storage for the video, or maybe you are saving the video to a directory that doesnt or cannot exist, like a usb thats been removed from the system.

as for morrowind crashing im unsure, i havent tryed playclaw with any "bethesda" games yet and the only issue with recording ive faced is a black screen for "just cause 2" ,

i doubt ive helped at all, but though a reply was better than none :)

*to save on storage id recomend recording to avi rather than mkv

best of luck