This is maybe a problem with tooltips shown below the mouse cursor, although my UEv12.10+1 does not crash on WinXP. Change or add following setting in the INI file uedit32.ini. See UE help topic "INI File Selection and Advanced Settings" where you have to search for the INI.

[Settings]
Allow List Tips=0

This setting disables the tooltips in all list windows (unfortunately except in the output window). List windows are all windows which you can enable/disable in menu View - Views/Lists with the text "List" at the end.

Save and close uedit32.ini, close UltraEdit and restart it again. Check if the crashes still occur. If there are no crashes anymore, please write a bug report email to IDM support (see email address at top of this page) with your taglist file (if you do not use the unmodified standard taglist.txt) and what exactly happens. Don't forget to mention your operating system because it could be a Win2K or Win98 problem only.

I had the same problem. The function list tips displayed fine, but passing the mouse pointer over the tag list caused instant closing of UE. Mofi's suggestion appears to have fixed that problem.

Now to see if my other crash problem has gone away.

I now installed also v12.10+2 and can see the same problem. The tag list view has changed from v12.10+1 to v12.10+2. Now not the description OR the tag is shown, both are shown at the same time and with tooltips enabled UE always immediately closes/crashes when mouse is moved over a tag. I switched back to v12.10+1.

The problem was solved in v12.10a. Update your UltraEdit version if you have this problem.