We're contacting support now but just so you know,
We've just added a new computer as a master with a fresh install of Windows 10, all the latest versions of VEPro 7 on all slaves and master, TCP and UDP ports are setup properly, advertising on local network is turned on and the bonjours service is running on all machines. We also tried both VST2 and VST3 on the local machine. It feels like we've tried eveything and the same issue is happening on multiple setups at different locations.
Since my collegues and I are experiancing the same issue on different setups and networks means this is NOT a isolated case. We strongly feel we should get compensated for all the time we've spent troubleshooting this without any positive results. At this point, it feel like we are beta testing this software that is simply now working properly. We need to be able to see the servers we connect to. Manually entering the IP adresses and instance names is not a viable solution for us.
By now, we have read the manual several times and both the manual and this forum have failed to help us in any way. We now wish there was an alternative software to VSL's Vienna Ensemble Pro.
We strongly recommend to anyone who is thinking about upgrading from VEPro 6 to VEPro 7 to keep working with VEPro 6 as it works fine and no added features of the newer release is worth all this hassle.