App update problem

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http://forum.xda-developers.com – I am running just a stock rom 4.0.4 with HTC sense 4.1 on top. Currently when I try to update any of my existing apps e.g Ebay it downloads the file but then when installing it says insufficient storage and aborts. In terms of storage I have 1.52gb internal and 21.94gb phone storage so plenty free. This doesnt seem to affect downloading new apps. Thanks for any help or pointers you can give. (HowTos)