Edward,
I'm afraid I've spent so much time trying so many things that I'm not sure of everything I did. I was able to get Cutline work properly on one blog but, when I tried to create a second one on the same site (using a different directory), the problem with the IE vs. Firefox problem surfaced. No matter what I tried, when looking at the blog in Firefox would reveal that all of the formatting was gone (as if there was not a css file) - interestingly, there were no problems with IE. It wasn't until I completely destroyed the second blog (all my data was backed up) and recreated it that I uploaded Cutline, using ftp (I used the program, FTP Commander), that it finally started to appear "normal" in Firebox.
Now, I'm battling the random image problem again. I was able to get it to work on my first blog but, even now, the second one seldom displays a new image upon refreshing to page. This is all very, very frustrating.
FYI, I'm using the 3 colume Cutline.