Version 5 doing weird things

I updated to 5.1, but now I'm getting some strange things. I have gone back to work on some of the projects and when I bring them up they seem OK, but after I save them I start losing things. The Menu page while in the program comes up blank - even after resetting the page. Same with printer friendly pages happens. Or I have a form that shows a status of a participant that in version 5.0 if you put your mouse over it would display the info without clicking on it. Now in 5.1 it doesn't do that. I've removed and reinstalled software - but that didn'y seem to solve the problem.
I did copy the old layouts and styles into the version 5.1 folder so that I had them, but I would think that shouldn't cause this to happen.
Any suggestions? I really like the product so far, with the exception of this problem. Any advice would be appreciated <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=6327&image=1&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />