Out of Temporary String

Hi netters \\-), We have a program that runs on a client's machine many times a day. It's an input screen that logs incomming customer replies. And usually after the user enters 50 records, the program bombs out with the -4518 error which is the "the 4GL program cannot allocate any more space for temporary string storage. My question is how can we identify what things are being stacked on the temporary string. What are the things I need to watch for besides: 1. returning char values from a function. 2. the using, spaces, and ascii functions. 3. some forms of the case statement 4. the upshift and downshift functions. Or can I somehow clear the temporary string before the program is run every time. I know this question might have been posted to the Net a while ago, but I appreciate any help you can offer so I can get this problem solved once and for all (and get some sleep). Thanks in advance. Anna