[SOLVED] "Open" and "Uninstall" Greyed Out in Android Market

With ROOT Access:

1) Terminal Emulator
Type: rm -r data/data/com.android.vending/cache
Press ENTER
Type: Reboot
Press ENTER

If this doesn't work, you can also try

2) Terminal Emulator
Type: rm -r data/data/com.android.vending/databases/*
Press ENTER
Type: Reboot
Press ENTER

You need to reboot because the Market App is always resident and will not update its cache and databases until it is restarted

via "Open" and "Uninstall" Greyed Out - Android Market Help.