@Sifres For Faust I had the same issue recently. Is your Faust node in a frameProcessing container by any "non-chance"?
That was my case so I've made a PR to fix it (in fact I made it then it was removed because I was fiddling around because I was trying stupid thing with git because I'm an idiot because... Well, I just re-pushed it)
The export wasn't processing the signal as frame, only as blocks...

@dannytaurus Thanks for suggesting and sounded pretty promissing tbh. However after manually changing the code for this, recompiling hise -> Export plugin, it still fails silently.

Very frustrating tbh.