all hosts disappeared

[dOCtoR MADneSs <doctor (at) makelofine.org>]

Hi,

I tried to rename a host, according to it's new name :
~xymon/client/bin/bb 127.0.0.1 "rename OLD NEW"
then after a refresh on xymon homepage, I can't see any of my host. I 
tried to restart xymon server, to undo my change (rename NEW OLD), but 
nothing changed. when I try to access the status of a unchanged host :
https://BBDISP/xymon-cgi/bb-hostsvc.sh?HOST=ANOTHER_HOST&SERVICE=conn

I get the following message :
Status not available

My filesystems are OK, and I can't see any error, in fact I know where 
to read xymon client logs, but not server logs...

Thanks for your help, I'm scared :-(