After the latest update tonight I got the following error.
[2007/04/16 21:31:05-317-x1]: Chronometer-0.10\Core\Chronometer.lua:726: bad argument #1 to 'gmatch' (string expected, got nil)
<in C code>: ?
AceEvent-2.0-32527 (BigWigs):322: in function `TriggerEvent'
AceEvent-2.0-32527 (BigWigs):1009: in function <...ce\AddOns\BigWigs\Libs\AceEvent-2.0\AceEvent-2.0.lua:1002>
Okay, I think I fixed it, but I don't know how to duplicate what you were doing to test it. If it still happens, please let me know what exactly you're doing to cause it (spell you're using, etc.)