F11 yum: "Running Transaction test" for over an hour ??

[sean darcy <seandarcy2 gmail com>]

Running yum upgrade on F11, yum dl's a modest amount of stuff - mesa, 
firefox,etc. But now it's been running transaction test for over an hour 
on two different machines! Even for really big upgrades this never has 
taken more than a few minutes.

Any clues?

sean