yes, re-downloaded and installed the addon manager then ran the FSDT updater.
We are starting to run out of options.
Of course, I cannot reproduce the problem in any case, so I'm trying doing fixes in the blind. Now not only we don't do anything related to rendering anymore but, it's even more optimized in the sense that, regardless if there's something to render or not, the special PDK render routine is only called twice at most and won't be called again unless there *is* something to render (which is not the case yet, since there's no released product that use that feature) AND this thing has changed somewhat. Before, it still wasn't doing any render, but it was doing "nothing" at every frame, now is optimized as it can be, even more than the sample I sent to test.
So, I'm starting to believe your problem might not even related to this function but, I'm afraid it's almost impossible for me to work under these conditions.
Assuming there is a problem (I'm sure there's none, it's more likely something specific of your configuration that doesn't play right with the new PDK functions of the sim, which probably no other developer started to use, so you are not seeing with anything else, yet), the first requirement for having even a slightest chance of fixing it (assuming I can fix it from my side, and it's not, instead, something that only LM can fix, which I think it's more likely), is to be able to reproduce it.
Perhaps we might try with a Teamviever session, so I might have a look at your system. PM me to arrange it, if it's ok for you.