DRM Issues BACK with 2.1 Firmware!

Omg! How did this happen?

It's back again. Some 3rd party apps not working and some are...well it's better than last firmware where all apps were not working (except for the native ones). I did try deleting the software from the iPhone 3g and then installing it through Appstore within the iPhone and it started working again!

Now out of 89 apps, I don't know what works or what doesn't work unless I go through each one!

Anyone know what is going on or a faster fix or just a simple explanation what could have caused this so I can avoid it!

I do sync using two computers but both are authorized with same apps.