TDM Busses not working sometimes

[RicardoEscallon]

I am experiencing something really weird I had not seen before.
I open an Aux stereo input for a reverb, and send signal to it using a send and one stereo bus.
I can see the signal in the send's leds, but nothing gets to the Aux Input. If I remove the TrueVerb (or whatever) from the Aux Input there is no signal yet.
I tried the usual when these weird things happen, which is Quit ProTools, run DigiTrash (an Apple Script I have for trashing DAE prefs, DigiSetup), shut down and restart the computer refreshing the PRAM and rebuilding the desktop.

Nothing happens. I create new sessions and always see the same behavior. In some sessions the bus works, in some others it doesn't.

I am using:

PT MixPlus + DSP farm
Magma Chassis
G4 500 DP OS9.2.1 512RAM, ATTO SCSI card, Jeronimo Card, Miro DC30
PT 5.2 software version

[slangification]

I get that occasionally, but a shutdown/restart solves it. I shut down the computer and the interface for about 30 seconds before rebooting.