I can’t find how to switch off the Error Messages which appear (in bright green text) in the VFB window when choosing Region Render (Interactive Rendering) ?
At the very least, they should stay in the Top Left corner of the images and not within the Render Region being rendered (as that obscures what it is one is trying to view rendered !).
Yes, they can be disabled if you switch to ActiveShade and in the Advanced mode scroll down to the bottom of the dialog - there are two options there. You are correct that we should probably remove those completely though, they should go into the message log window.