Do Audio Experience Symphonies leak DC current?

I'm thinking about trying an Audio Experience Symphonies preamp, but i read a post where someone said their symphonies pre leaked dc current, putting their classe ca-100 into protection mode.

here:
http://forum.audiogon.com/cgi-bin/fr.pl?rprea&1047509999&read&keyw&zzsymphonies+classe

i have a ca-200, which also does not like preamps that leak dc current (per manual).
has anyone else had this happen with this preamp, or was this case an isolated incident caused by a faulty component in the preamp?
thanks