Two possible problems could be that you do not have all the latest formuals that a UPR could possibly use. Go to the UF formula database and download the entire update and unzip them. Go to JPP's resource pages and locate the links to the half dozen or so formulas that are not in the UF formula database, such as Edward Perry's or Stig Petterson's, and download them as well. There should also be a link for the orgform.zip and it would be wise to get it. If you don't see a link go to the Spanky database for Fractint and download and unzip that. That should get you completely up to date with all publicly available equations and formulas for UF. A second problem may be a simple error in cutting and pating the UPR in from the email. Just put the cursor on a word, hit "Ctrl A" to highlight the entire text(UF ignores text outside the UPR), then with the fractal image window of UF active and highlighted, NOT the properties windows, hit "Ctrl V"(or use Edit menu) to paste the UPR into the fractal image window. Sometimes UF takes a second to recognize and find all the formulas in a UPR and searches it's folders to locate them. After all an image can not only have multiple layers, but each layer can have different seed image formulas, inside and outside coloring methods as well as a transformation or two if an author has incorporated all those things. This should clear up most problems, but others more experienced may have other solutions. If that doesn't solve the problem, then it's not likely a problem with UF. If your computer hangs with any other graphics apps, then consider reducing the speed of the graphics hardware accelerator.