Interesting... So I suspect the problem is browser/local related. I design following cases to find the really problem.
Installed Geronimo build 20090107_1500 on Windows XP SP2 English, and then
To access admin console from a machine, whose local is English:
1. In IE7 or IE6 – console doesn't work, but others are OK.
2. In firefox 3.0.5 – all words work well.
To access admin console from a machine, whose local is China (admin console shows Chinese). In this case, no mater in firefox 3.0.5 or IE 7, filter failed on ALL words.
BTW, when typing keyword into filter, I didn't use quotes.