It looks like you're running CFB1 without the update
If you have Flash Builder 4.5, did you buy this on it's own? As from what I
know if you buy CFB 2 you get FB4.5 Standard as part of the package.
I installed FB4.5 seperately from CFB (installed as a plugin into FB4.5 standalone). I did seperate trial downloads and got the license keys later, hence, no all-in-one CD/DVD.
When I do a check for updates, it tells me that no updates are available. I did have CFB2 installed for a while but I ended up uninstalling it. Chances are good that the CFB1 uninstall, CFB2 install, CFB2 uninstall, CFB1 reinstall is the real source of this problem. I'm thinking of doing a complete gut of everything eclipse related and then starting from scratch with eclipse helios followed by FB4.5 plugin and CBF1 plugin and finally, the updates.
I'll report back after I finish.