Game freezing when showing navigation bar

When I swipe open the hidden Navigation bar on Nexus 7 the game freezes. Is this because I’m compiling with SDK 21 instead of SDK 23? (The hidden navigation bar is a new feature I believe). Or is this irrelevant? (Unity 4.6.1p3 using the new GUI)

(I’m having trouble updating the Android SDK). If I update my Android SDK to SDK 23 will I still be able to compile games in Unity 3 (which I need to for certain old devices)?

Bringing open the nav bar seems to make my game sleep or freeze. The same thing happens when the onscreen keyboard pops up.

I can sometimes get it to unfreeze again by going to the app select menu and back.

Do I have to add a manifest to change this?

I tried another game I made in Unity 4.6.1p3 and the same thing happens.

Anyone else published something on Android with Unity 4.6.1 with the same problem?

Any ideas?

No worries. I downloaded Unity 4.6.4 and it seems to be fixed. Just one day wasted. Cool. :)/ Isn’t programming fun?