Thank you! Yes, I think that's what happened. Any ideas on how to track those down? I'm not an expert programmer, and I tend to use a lot of trial and error to get things working. I sometimes make changes to things without fully understanding what they do ... and then I forget to change them back

Can you provide an example of what might cause a memory leak?

I have heard about them, and how bad they are, but I can't say I fully understand the concept.