I've never had problems with PD 4 (also betas). 3540 run fine. I have big problems with the latest "hotfix" 3810!!! When resuming my XP VM it takes AGES for it to become responsive. I have uninstalled and reinstalled tools etc. The problem stays. I have reverted to 3540 and it resumes as it always has and becomes responsive immediately. I have filed a bug report already without getting an answer.