Thanks for your replies.

That unplugging and plugging back in solution (That I posted in the Realband forum) 'seemed' to work that one time. But the problem reappeared the very next day. I tried everything that I 'thought' had made the problem go away the day before. It did not work.

I went on live chat with support a day or so after that. The support rep had me send him one of the offending files. (Any sequence I make with BIAB 2015 causes this problem) He said it caused a problem in his Realband too - which he couldn't figure out - and said he would forward the file to the development people and they would get back to me.

That was about a week ago. I'm sure they will get back to me, but because no one else seems to have this problem I'm sure it is something simple that I screwed up myself. Hence my posting of this question about whether I should have uninstalled before installing.

I was just hoping I could fix it myself since I'm getting anxious about waiting for them to get back to me.

My BIAB 2014 still works- but because of this problem, I can't do anything with 2015. It is frustrating especially when I bought the most expensive 2015 package.

I have a 6 month old quad core i7 PC running Windows 7 (64 bits)
I think I am running everything from the harddrive. That's been my intention anyway...

Thanks again for your helpfulness