Sounds like you got around it, but in case the Slickedit crew is reading this, I think this may have to do with the 'keyboard input methods'. I ran into this under FC 6 (latest service), running Gnome. All was working well until I installed a set of Chinese fonts. After that, I ran into the same problem, the 'Find' command would render the keyboard useless inside of Slickedit.
I got around this by going to the 'scim' configuration, and disabling it. I am theorizing that the installation of the Chinese fonts also installed a hook for entering Chinese characters with the keyboard. This in turn caused a conflict.