EXS 24 Logic Sampler Users Group

dear exs-users!

i joined this group because i have to deal with a strange problem. all 
of a sudden, my exs can not be assigned as a multichannel-instrument 
anymore. its no longer in the list of multichannel-instruments.

when i load old songs (where it  had been a m.c.-instrument), i get the 
following error message:

    asio: plug-in exs24 of type 1-0 not available!

of course, i tried trashing preferences, didnt help.

please help me, im in the middle of a theater production...

thanks!
sebastian