Default [Q] Not enough space, but in fact yes

Hi all,

I am running SlimKat on a Galaxy Tab 2. I am trying to install an app (Dungeon Hunter 4, which requires 0.95 Go), but I get the error "Not enough space". Yet there are still 8 Go (+4 Go on the SD card) left. I am really puzzled and I would be grateful if anyone could suggest a solution.