I think I may have found your solution. (It worked for me.)

I'm running LimeWire 1.7 on a Mac G4 w/ OS 9.

If LimeWire consistently crashes when you click outside the application itself, try increasing the memory allocation of the program. To do this:

1. Select the LimeWire 1.7 application
2. Go File --> Get Info
3. In the Get Info window select Memory from the pop-up menu
4. Change the Minimum Size to the Suggested Size
5. Bump the Preferred Size higher. (I set mine to 10,000)

Hopefully this should help all you ailing LimeWire users!