So it seems that FLAC files make supersonic hang, and eventually crash Flash. It comes up with an unresponsive plugin box after about 10 seconds of hanging and lagging music. Dunno if this is the right place to put this.
Running up-to-date Flash on Firefox Nightly on Win7, but this has happened on several different browsers on several different computers. The supersonic build is 4.7 beta 1, on Linux Mint 14 (Nadia). Anything I can do?