I should really post this on XDA devs, but I can't be bothered to create an account right now, so am posting it here in case someone else had the same, or similar, problem.

Using Cyanogenmod 10.1, works an charm so far, except for one annoying issue. My home screens are set to 4x4 but it can only use 12 of the 16 "grid spaces" on my main screen. If I try and put anything else on there, it says "no more room on this home screen". All other screens can use all 16 of the "grid spaces".

Any ideas how to fix this?