MailMonitor - Explorer Crash when adding AND condition

1. "Create new filtering conditions based on selected message" OR "Edit filtering rules" and Double click on a condition in the Filtering conditions box
   
2. Click AND button to add another condition (the inputs on the right should contain random stuff now)
   
3. Change the random stuff to a condition you want to add
   
4. Click OK
   
5. Explorer will crash

I don't think it happens every time because I do have some AND rules that I managed to create. I think it may happen more consistently with "Edit filtering rules".

TLB version: 4.1.2
MailMonitor: 1.20.0.0

Windows Version: Microsoft Windows XP Home Edition Service Pack 2 (Build 2600)
Shell Version:6.0.2900.2951
Internet Explorer Version: 6.0.2900.2180