Stained glass pieces

I found and complete all of the other collections, except for the stained glass window pieces. I have 71/75 pieces and now they just are not showing up anymore. Anyone else have this problem?

i have the same problem...
any suggestins to fix that?

ok, after restarting the game the pieces were coming again :-)

I'm having the same issue and I tried exiting and starting the game up again but so far no more of the pieces are showing up and I've completed the other three collections. Is there some sort of event to get the last 4 pieces?

same problem. haven't tried restarting the game, yet, tho. will try that in a few. thanks for the tip.