Can anyone tell me why I sometimes get an unknown error 18 when downloading some apps from the app store?
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Same issue here it appears http://www.droidforums.net/forum/dro...nown-18-a.html
Try clearing market first before formatting SD.
go to settings/applications/manage applications/all tab/select market/force stop/clear data
Now try the market again
Sorry, I don't have anything else. Other than a factory reset or format the SD card. Move everything from the SD to your PC and then format it and add back only needed files and see if that works.