Hello MB,
I have Mountain Lion running on my because I can't upgrade to a newer OS due to software incompatibilities on later OSs so I have to stay on Mountain Lion. I have MalwareBytes for Mac Free 1.2.5.715 I think which is the last version supported. Everytime I want to update or scan, it freezes on the scan word 'OSX.Komplex'. I have to force quit the app everytime that happens because the normal way doesn't work. It took me awhile to find the older versions because MB for some odd reason doesn't list them. It used to work before. However due to the fact I had a hard drive crash, I upgraded to the Samsung EVO SSD. I don't know what's wrong as it won't update and scan.
I'm using the laptop minimally because of this issue. I've been using MalwareBytes since 2010 so I'm hoping it's a minor fix.
Thanks!