I always have problems with the poring of polygons since I use CircuitStudio. Sometmes you can pour them and sometimes not.
At the moment I'm using CS 1.4.1 and I can't update it because of the expired subscription.
At the moment I can't pour any polygons on the bottom side of the PCB but on the top side it works fiine. Here a video of that example for the +5V power net:
Only exception: I can pour Polygons for the GND on the bottom side.
Before that I tried to pour the same polygon on the top side for several hours and it also never worked. But suddenly the problem disappears and it works now although I didn't change anything.
Can you confirm that this is a big in CS 1.4.1? Is that bug removed in the current version?
I use Altium Designes for more that ten years and had never any issues with polygons.