Learning new stuff here after 25y of Cubase and about 2y of occasional heavy issues.
Questions:
1- How do you turn on off Asio Guard for individual plugins ?? Did not know that was possible and cannot see it on the UI.
2- For those who create a MASTER bus to send everything to before going to the Stereo OUT, how do you deal with the FX? They cannot be routed to that bus, only to the Stereo Out… Do you just let go of that or do you now use FX sends but create buses instead.. ?
Thanks !
In the plugin manager.
That doesn’t sound right. Make sure your “MASTER” bus doesn’t have any sends defined that would prevent it from receiving the FX return.
Thank you my friend that worked indeed, I had FX setup by default. Learnt something new for both those things, thanks again ! 
What version of Cubase are you using, and how are you creating your MASTER bus? In every project, I use a Group Track labeled “Pre-Master” and route everything to it–it’s the only thing I have routed to Stereo Out.
My issue is when creating the “Pre-Master” track it automatically loaded the FX sends routing, which made it impossible to route those FX sends to that bus as an output. Once I removed the Sends Out from Pre-Master, I could route the FX outs to it.
Now I need to test if this Pre-Master routing reduces audio dropouts and improve CPU use on some projects that give me trouble.
Thanks!