How can I fix buttons on Flip Ultra without breaking the camcorder?

My flip video ulta 2nd generation camcorder was bumped on its side last week and a few of the buttons stopped working. mainly the up, down, left, and play buttons. I can still record and turn the device on and off. It also still works with my computer.

I attempted to open up my camcorder, thinking I could solve the problem on my own. I've seen the tutorials on how you disassemble a older version of a flip video and though it wouldn't be that different. I ran into some problems after unscrewing the two half's. The top part just won't separate as smoothly as I thought. like it's hooked or glued together on the inside. I stopped in fear of damaging my ultra more. I've looked all around the internet for a better step by step guide on how to repair flip ultra 2nd generation buttons but have found none. I've even tried going through the customer service like first but to no avail.