Hi @Max, Overwriting shouldn’t be a problem! Is it the same file from yesterday? Does the new simulation show up on Pollination? In case the file is from yesterday try to right click and log out and then log-in back.
The error message should be caught in the logs. Plugin doesn’t know when the log-in is expired as long as Rhino isn’t closed. So it only know the issue when the plugin tries to talk to the server and the server complains.