Hello,
I've been having some issues even trying to edit the timeline. It causes vegas to stop responding for a few minutes, before letting me make changes to the timeline again. After making more changes however, even something as simple as splitting and deleting a clip or even just playing the preview, it would freeze again. It has made editing almost unbearable for me. I used to have an Intel Pentium G3240 processor, but was meant to be an i5-4460 (amazon sent me the wrong one) I got a replacement and installed it just a few days ago, thinking it would fix my issue, but alas, it has not. Every youtube tutorial about the matter has not helped me whatsoever, turning GPU acceleration processing on or off has done nothing, decreasing or increasing the amount of dynamic RAM processing threads has done nothing, turning multi-core playback off has done nothing, even downsizing the preview window and switching it to the lowest picture quality possible has done nothing. At this point I'm out of ideas, and would really appreciate the help if anyone is knowledgeable enough about my problem. Thanks for reading.