Nothing happening...

Are there any known incompatibilities to True Launch Bar? I can't run it at all for some reason. The task starts, but no toolbar ever comes up. Any files or dll's I should check versions on? Does it interact with any system files?

I don't know abou any incompatibilities. To be sure TLB is registered correctly and all dependencies are valid run the command:

regsvr32 "c:\program files\truelaunchbar\tlb.dll"

If this command don't report error then TLB registered correctly.

Also try to read this topic. It describes the registry fixes.

One other clue: when I try to open a toolbar from the toolbars menu, I don't even get the dialog asking which toolbar I want to open.

By default TLB don't show dialog box if this is the first toolbar. Hold down the SHIFT key when click "True Launch Bar" menu item to show dialog box.