I've been using Sony Vegas Pro 13 for a while. It has been working nicely, however it suddenly started slowing down. Within preview a simple fade out/in is almost impossible to watch (it is basically a standing image) Restarting both the program and the computer has not solved the problem. The content of the Temp folder is the right size (3,08 Mb). I've tried loading it in Pro 15, but it is still slow. Any ideas?