I am using ver 3.3.12. If I have a project already open, and start a new project, I do not seem able to save the project using Save As. The only way I can get it back to working again, is to close the project completely and kill the process (it seems to be hanging on to the process even when i shut the project window down). When i open it back up, my new project is there and saved as the default project name i think, I can then save the project with the correct name.
I think when starting a new project with one already in use, it seems to open a new session and then perhaps gets confused
I have seen some issues that appear related to this, however they are from 2015.