When will a new version of RPR for Blender be available? I keep having the same problems with fireflies whenever I enable portal lights. There is also a bug where the render comes out all dark and I can only fix it by going into the wireframe view and restart the render.
There is a 2.5 beta. I tried it earlier today and it crashed instantly with 2.9 on my Macbook / 5500m. Tried with a the default cube and had the same issue.