Microdescriptor cache fails (Tor can't write to it)

Tor Software Error - The Tor software encountered an internal bug. Please report the following error message: "microdesc_cache_rebuild(): Bug: Discontinuity in position in microdescriptor cache.By my count, I'm at 1760119, but I should be at 1760185 " Attached you see the log of Vidalia (what is left). It's a bridge (0.2.4.12) running on Windows 7.

I never saw this error before.

My normal reaction is restart the damn thing, but the bug says I should report it. (I don't see errors at all).

Tor has permission to write to the folder it attempts to. I can't see anything locking the file. Tor has created the file previously and there's only one Tor instance running.