• start QC, have some Qt versions and kits configured
• create a session, switch to it
• create a simple project
• configure 2 kits for this project
• add 2 run configs for one of the kits
• (I've built and run the project for each kit and each run config, but I'd assume this is irrelevant)
• close QC + restart QC
• reload the session

Current result:

• QC complains about .user files being unsuitable for the current version of QC