Samsung Galaxy Tab 7.0 insufficient memory error

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http://androidforums.com – I am having problem installing anything in to my Samsung Galaxy Tab 7.0 , the internal memory is completely free (16GB) , also the device 2GB memory is free , I've replaced the default SD card with a new 16GB SD card, but i couldn't be able to install anything instead of lot of free space. Any one no what is the issue ? P.S: the SD card is working properly, i factory reset the device already (General)