I can recall that there was a recent change in the zrtp cache behaviour that fixed the location of the cache file instead of taking ./!. See if you have the directory for the cache created.
I am getting the similar problem.
I can see while starting up the FS.
2013-03-19 07:54:20.425555 [DEBUG] switch_rtp.c:916 [ zrtp main]: ERROR!
cache on_init() callback failed <Unable to read data from the file/stream>
2013-03-19 07:54:20.425577 [CRIT] switch_rtp.c:957 ZRTP init failed!
And everything is running as a root user!
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