Rewired Bidule & Rendering Breaks Bidules Sync

O.k experiencing some problems here with renoise 2.1 r.c.1 …Bidule as rewire slave ( runiing some plugins in bidule with stepsequencers )
When rendering a selection to sample …the first 4 bars of the rewired instance sometimes aren’t rendered …after rendering the selection the rewire connection is sometimes broke .
After the connection is broke I can stll play the instruments in bidule from renoise from the keyboard …but ther is no more syncing when playing back the arrangement

This looks more like a problem in Bidule to me than a problem in Renoise. Would be great if you could post the two songs (Renoise + Bidule) here, so that I can ask the Bidule devs to take a look at this.