To expand on what Haste said.
First of all download and install
BugSack. BugSack and !Buggrabber need to be installed into their own folders in your AddOns folder.
Then log into WoW. Did you get a bug message (you will see a red sack icon in your MiniMap/FuBar/LDB Display and hear a "Fatality" sound bite)?
If you do, then click the red sack icon. The BugSack window will pop up. Copy the contents of that windows (Ctrl A to select all, Ctrl C to copy). Then paste the contents into a reply to this thread. This much more helpful than simply saying "Its broke".
Posting what layout you are trying to use in addition to the version of oUF (plus any oUF plug-ins) will also help.