[Stef Goodchild]

I have found the *exact* same problem, but from a different angle.. I’ve posted a detailed post (not yet appeared but called something aling the lines of PAL NTSC audio sync problems) that details how to re-create the problem.

Do you work in PAL and NTSC from time to time? It may be linked to that…

Read my post and maybe reply if my re-creation of the quirk is repeated for you.

Rgds, Stef