I'm using iPhone 2G out of US (i.e. unlocked, jailbroken) on firmware 3.1.2.

I upgraded to 3.1.2 using blackra1n rc3, but have encountered problems installing 3rd party apps since...all applications loaded to iTunes are not recognised and cannot be installed properly.

Anyone have any suggestions/solutions to how to go about fixing it? Feeling a bit down that I can't install those not downloaded from iTunes. Cheers!