Support Insufficient storage

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http://androidforums.com – I've tried the search several times and couldn't find it but when downloading from playstore any file above about 12mb it doesn't finish install and states insuffient storage available. I have 640mb internal and 470mb on internal SD, I am rooted now and have tried to find anything hidden or not by es file manager and still can't find it. I did have the problem well before root and to the best of music recollection it started at the playstpre update before last and if my memory serves I managed to uninstall that update, I can't remember how I did that and I'm beginning to doubt that I have. Doe (General)