General sdcard not freeing up space after app removal

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http://androidforums.com – Yesterday I downloaded NOVA 3 for my S2 - a process which took about 8 hrs ! After playing the game I found it wasnt for me so I deleted the app. However the sdcard has not 'freed up' the 1.8G of data space. I`ve rescanned the card, checked all files I can think of on both internal & ext sd cards but cant find an appropriate file, the gameloft folder just has data for another game. I read somewhere about the LOST+FOUND file in /system but this is empty too. anyone come across this before ? (General)