Default snapchat problems at custom roms (except gin2kitkat)

hey guys. I have problems with snapchat. I dont know why,but at stock ROM's and ONLY gin2kitkat it works very good but when i flash an custom rom (i think all of possible here) it make's this app buggy. Sometimes video doesnt work,sometimes camera wont get focus,sometimes it just crashing around.

What the hell make's it buggy? maybe its something in kernel?

I am asking because i want to have ICS rom with Xposed modules but at ICS my snapchat is bugged :/
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