I Can't Turn In Collections.
Collections at the moment are clunky at best but often WILL work, even if they seem not to.
Each time I trade in a collection it takes 3-5 minutes to work the first time. During this I may get a message saying Shockwave has stopped responding.
The trick is patience. Wait, let the game do it's work, get a tea, coffee or beverage of choice and let it work. If you get the message about Flash not responding, say NO to stopping it.
Hopefully it should work, and then all future trade-ins are smooth.
If however you've waited 10 minutes OR it crashes your game, contact Zynga.
Please remember we're not Zynga, these are simply steps we've devised over the months of playing that may help solve some of the in game issues.
If you have something that isn't covered here, please come and ask us a question on our Facebook Page.