Hi again Frank,
I got the following reply from PA support:
"Hi Magnus Nordén,
I’m sorry to hear that. We have had some reports that lead us to believe there may be a conflict with our plugins and RME’s interface drivers on Windows. There are a few things you can try, but the first thing you should do is delete the Sandman and see if it solves the problem
To do that, open a browser window on you desktop and enter each of these directory locations. Some of these directories may not be present on your system, depending on what DAWs you use.
C:\Program Files\Common Files\VST3
C:\Program Files\Common Files\Avid\Audio\Plug-Ins
C:\Program Files\Common Files\Digidesign\DAE\Plug-Ins
Go through each of these folder windows and find the Sandman, and move it to the trash. Then see if you project works. Let me know how it goes.
The Plugin Alliance Support Team"
I did as told. Since I only installed the VST3 version, I found only one instance of the plugin. After deleting it, the project is still broken, i.e. I still have no audio on the two affected channels.
I then did an uninstall of Sandman via Windows, as you recommended. Still no audio on these two channels… But the other six audio channels are fine! (As they have been through all of this.)
I guess I could just create two new audio tracks from the wave files, but I would lose hours of work on one of these channels, where I have muted all the parts on a 17 minute sax recording, where the sax is not playing…
Also, it is disconcerting that PA confirm that they have been having issues with RME interfaces. However, I cannot really see how this could be a soundcard driver issue, if it affects two out of eight audio tracks - and not all.
Any more ideas on how to recover audio on these two tracks would be greatly appreciated.