Help! 7.20.UD1 sperform dropping core.

We recently upgraded our develop machine to IDS 7.30.UC3 and all of our development tools to the latest releases. We now are having a problem with sperform dropping core with certain Perform screens (this is occurring with the original sperform runner not a customized version). We have not been able to isolate why these particular screens are causing problems outside of the fact that the result of joining two tables is displayed on one screen which seems to be the only common factor. It is a fairly easy problem to reproduce. You do a query, hit escape, and exit the screen. The result is a core dump. Since this was only discovered on Friday afternoon, I haven't had a chance to call Informix Tech. Support although that will happen first thing Monday morning. However, because this is a very serious problem for us, I wanted to see if anyone else has had similar problems and if they found a solution. Any help would be greatly appreciated! Here is the version, OS, and machine info: IDS 7.30.UC3 Informix-SQL 7.20.UD1 Solaris 2.5.1 Sun Sparc 20 Again, thanks. Dennis