Hello John,
I'm using a beta version of MLO for Windows and I can't replicate your crash. I've tried various advanced filter combinations using TopLevelParentName and TopLevelFolderName is "xxxx" or contains "xxxx" - With each filter, everything is rock solid.
Is there anything else about your filters or sorting?
The other possibility is that there's a corruption in your MLO data file. That happened to me one, quite a long time ago. I used a text editor to track down the corruption and fixed it. To rule this out, you could try running MLO with a different data file, but with the same filter, and see if you get the same crash.
Good luck
Stéphane