I just ran into the ugly old tooltip-breakage bug from pre-1.5, but I think I may have a culprit.

If anyone has a savegame with a Blue-quality Widowmaker (the tech rifle from Nash's steaming, traitorous corpse): load it up, try upgrading Widowmaker to Epic/Purple. Do all weapon and item tooltips immediately break?
If so, make a new hard save, exit client, load new save. Are all other tooltips restored, but Widowmaker's never comes up?
After that, with Widowmaker equipped and Comparison on...

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