I've had this happen to me, too. What I do is, before I update my formulae, I back up all of my upr's from my "wip" folder, my "Formulas" folder and my "Gradients" folder. When an image gets "broken", I just go to the latest cd that it opens correctly with and replace the "broken" formulas in your public formula folder with the version that works. I just spent half an hour figuring this out again - had to go way back to Nov of '03. Luckily, all 9 broken layers used the same formula from the mjd.ufm file. I had to copy the formula from cd and then replace the one on my C drive. It's a pretty old pic that's been sitting around waiting a LONG time for me to figure out if it's worth posting or not. Reckon it's been "broken" for over a year and I just noticed it. And just opening the upr from cd, re-saving it to your C drive and saying "Save formulas" doesn't seem to work because the upr still tries to look in your C drive public formulas. So you have to totally replace the formula file with the older version. Anyhow, I sorta agree with Andreas - it's become evident to me that maybe you update your public formulae at some risk to your earlier work and I would NEVER do it without backing up the previous formula folder first. Probably the best thing to do might be, when a formula writer announces a new set of formulas, just see if you can get them to e-mail them to you separately to avoid any unannounced revisions to others? Good luck! Rick