Update:
After having my hosting company roll back my site twice the problem was still there. I then completely deleted my forum folder and database. I created a new forum folder, created a new database then reinstalled the forum from scratch. I tested the forum before importing my old PHPBB2 database when the only registered user was "Administrator" and the problem WAS STILL THERE!!!
(I even used different database and folder names so there was no chance of confusing new files with previous files)
I talked to the hosting company several times and they had no clue what was wrong. Finally they changed a few things on my account (I don't know what they did) and I deleted the redirect I had in place and now everything works fine again. I had a redirect from the old forum folder to the new forum....
http://www.myurl.com/forum -----> redirected to -----> http://www.myurl.com/forums (notice the "s" on the end)
I cant see how this would "confuse" a computer but it might have been my problem. I now renamed my old form folder to "oldforum" and named my new forum to the original "forum" so I no longer need a redirect.
Long story short...... I don't think deleting the style from the database had anything to do with my original problem. It was just a coincidence that I noticed the problem at that time.
Who knows..... It works now!!
Thank you to everyone who replied in this thread.