This is an issue with both computers - PC and Mac.
After saving, for some reason, everything looks fine but no audio is flowing through the main out.
All is the same as I saved it day before, all the meters showing that all is OK and alive but nothing gets through the mains.
Couldn't find the reason.
The projects are with Video track and all kind of VST's and VSTi's.
All I can do is to go back to earlier project backup and it is really bad. I lost tons of work twice already.