Audio plugin auto-muting track

Hi all,

I’am working on a juce plugin. I do some interprocesscommunication stuff to drive my plugin from an external program. This external program which his acting as a server receive MIDI events and transmit them to plugins loaded in logic.
Everything is behaving as it should, except the track containing the plug becomes muted sometimes and i don’t know why.

Any idea ?

I’am using juce 1.46 on macOSX 10.6 with logic 9.