When connecting via a PSM session such as Unix, Linux or PSM Web Access, a 2nd window will open in the background but may occassionally jump to the foreground (when the mouse is hovered over it). The window is titled "PSM Desktop" and it displays the error:
Xlib: extension "RANDR" missing on display ":5001.0".
This is a known issue and is expected behavior when PSM Affinity is set to a DPAv3. The error can be safely ignored..