I formatted and fresh installed Yoesmite last night and most of the problems went away.
However, now I can't installed Pro tools. I know it works with Yosemite because it worked before (except it was installed under Mavericks) but it won't let me install it because it says it's incompatible.
Are there any workarounds like Windows Compatibility mode just to get it installed or am I going to have to run it in bootcamp (which I really really don't want to do as it runs much better in OSX).
The problem is, as I understand it is there is now no way of rolling back to Mavericks to install it (because I went through a fresh install).