Great post! I am new to the 318ti community, but not to BMWs. I have a few over the last 25 years. I'm running through a long list of renewal items on a 1995 Sport I recently picked up and both windows had popped their clips. I reclipped and greased them and they are operational again, but after I get through most of the list and when they pop again, I'll go through the alignment verification outlined by Jess. Thanks for taking the time to document your observations and repair method.
Cheers!