Using IC6.1.7 (sub-version IC6.1.7-64b.500.23) there are instances when a popup window will fail to be drawn on the screen. This happens often when trying to edit graph properties in VIVA or editing parameters in ADEXL. Looking at the CIW log with no filtering, it looks like the command is issued, but no window appears.
One possible cause that I can think of is I am using Virtuoso remotely. I never experienced this issue using SSH+X11. However now I don't have access to my university's LAN, I am using x2go (an open-source version of NX). Is this a known bug with Cadence Virtuoso and x2go/NX? Or is something else happening?
For reference, I am using Virtuoso on a CentOS 7.7.1908 server which I access using x2go 4.1.2.2 (an open-source version of the NX remote desktop tool).