Black screen on timeseries widget in QGIS 3.38

[deltamarnix]

QGIS 3.38 gives a black Time Series Plot and doesn't show anything. The window still responds to right mouse clicks for a context menu. I tried the same with QGIS 3.34 and that works fine.

As a workaround, I can change the line pg.setConfigOptions(useOpenGL=True) to False and the plot displays again like normal.
I have tried updating my drivers, but that doesn't seem to help.

System specs:
GPU Intel Iris Xe Graphics (Alder Lake)
Driver version 31.0.101.5388 DCH
OpenGL 4.6
Windows 10

Reproduce by:

• Open QGIS 3.38
• Click on the Timeseries button

[deltamarnix]

Also tested on a machine with a dedicated graphics card and that seems to work fine.

[Huite]

This shows up now and then without a good explanation. @JoerivanEngelen I thought you had figured something out in terms of a possible cause, or do I misremember?