Okay, I hope someone can explain this behavior to me. :-) App. runs fine inside FB performing all actions. Compile app. Alot 1000k to the app Run compiled app. Perform action A the first time and app crashes with Sys #25 err Increase mem alottment to 2000k Run app and it runs ok with no crash. Watch running of app with RAMHighwater Performing many actions, including Action A which caused the crash several times, the highest registered RAM use in RAMHighwater is 407k. Is there something which would cause #25 error except running out of memory? Is there a memory usage which does not show up in RAMHighwater? The offending Action A accesses the Rsrc fork. Could that, if done incorrectly, cause the 600k memory leak? Is there a Santa Claus? As always - TIA Roger M. Clary MacMUSE Software MacMuse@... http://members.aol.com/macmuse