FX Dry/Wet Problem?

[The Philosopher King]

I sent the follwing into ableton support recently. While I'm waiting for a reply, I'm curious to know if anyone else has experienced this:

I recently reported an issue to Rob Papen about RP-VERB.

I'd inserted RP-VERB on an insert and set the dry/wet setting to taste.

After a while I noticed that only the dry signal was audible. This has happened on a few occasions.

Last Night I replaced RP-VERB (Multicore) with StudioDevices (impulse response) Reverb (as an insert). I noticed after a while that the exact same dry wet setting problem occured. That is; after a while only the dry signal of StudioDevices Reverb could be heard. No wet signal.

[The Philosopher King]

I wonder if it could be some kind of controller information turning the fx section off. Some odd MIDI Control Data. My nocturn 49 seems to spew out a lot of information.

I should examine the MIDI File next time I have a similar problem.