Hey there!
Until yesterday Issac Sim had been working perfectly on my system but something happened and it cannot load scenes and graphics. Surprisingly it does not even show the GPU usage in the metrics tab and shows the fps to be 0. I have attached a screenshot of the window -
EDIT - USD composer works perfectly… Maybe the rtx is not being loaded in issac sim. I tried uninstalling and reinstalling issac sim but it did not work.