There are two main partitions on my AmigaOne G4-XE system - Workbench and Programs. Also have two small ones for browser caches and swap space (not yet in use of course). I downloaded and installed this update last night. At the end of it, the installer asks you if you want to reboot now or later. Well, I selected now, which it did immediately. However, it's apparently not a clean reboot because it invalidated my Programs partition. My system refused to completely boot up after that. I had to boot up with my Dev-PR Update #1 CD in order to get it to validate the partition. Then I was able to boot up normally again.