I was able to run simulations from PAT2 on AWS many times. Suddenly, instances sent by PAT2 are not launching despite many trials and restarting the software. I still get the message "Starting cloud cluster". However, no instance is launching at all on AWS as it used to show. After a while, PAT stops showing the message "Starting cloud cluster" without allowing to run the simulation. I can launch my own instance on AWS but not related to PAT2.