I've never seen this kind of surface scum but I've also never used wl 002 before either. Maybe my starter got infected? the liquid I decanted off the starter tasted fine. This was my first starter, I mixed it up, sat it on the stirplate for a few days and refrigerated it for a week before using. The starter wort was actually excess wort (hopped) from a EIPA which I diluted a bit with water.
It's been this way for a week at least. about 2 weeks since pitch, constant 65˚ temp. It's a (bigger) bitter, brewed April 5 at 1.072, I have not checked the gravity yet.
I've never had an infection in the 18 years of brewing.....
rdwhahb I guess...?