I've had that happen two or three times, but it never lasted across rebooting the machine. (It might be that I only shut down the application.)
Also, you know the info overlay only shows when you aren't in any of the loupe settings that hide or partially hide most of the UI (e.g., the "l" (ell) command), yeah?
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I just had a separate bug in which LR2 decided that it would display the other zoom factor when I zoomed out, e.g., I was at "fit" and "1:1", and I'd get a 1:1 image with the zoom marked "fit" and vice versa, and some other display bogosities. That problem persisted across a shutdown and restart of LR2, but did not in this one example persist across a system reboot.
That's ... a little weird, I know.