We've got a bug in our WuP2005 - We've got a single group containing two devices, a router and a server, and they are permanently down as 'unknown' status.  You can do a check now from within WuP console and they go green for available, but after about 2mins, revert back to being unknown.

The check is simply a ping every 60 seconds, but whats wierd is that the server 'icons' appear 'ghosted' rather than just unknown, so I don't really understand whats going on. 

N.B, this is WuP2005 Gold,  we haven't yet installed SP1 on our live system as we've got a fair amount of customisation that we are now transferring across, but I'd like to understand whats happened, incase it occurs again..

There is a screenshot at the link below.

http://coupeclub.daftdriving.com/members/digital.diablo/TEmp/wugbug.jpg