I seem to remember I have this problem with every new install of a new version of Vegas. Had to go to 14 to work with some ProRes files and now it's not remembering my tweaks.
Personally I never use the trimmer, and I have 3 monitors so I like the Preview full on one and the Timeline and media bins on another, I also reset space to play/pause and I use "`" to toggle my 40" monitor to preview.
EVERY Time I'm coming back into 14 its forgetting all of this and driving me nuts and I can't remember how to get it to remember to leave this stuff like I like it. Older versions have always settled down and done this. What am I forgetting?