Sorry I'm late to the party. Once, by mistake, I set up situation, which resulted in a negative DIM. I'm glad I found it quickly, before tearing out what was left of my hair. IN my case, the program would simply crash. I started removing portions, until I discovered where the crash was occurring. It took about five tries, and then I found a situation that resulted in a negative DIM. Yeah, QB64 HATES those varmints. it just spins through memory, until it's exhausted.
Pete