Marek, is this a project that was working fine and suddenly stopped, or is it a project you are trying to open that was developed in an earlier version?

If the project simply stopped working, please ensure you have restarted your PC. start wx5, select project, and click backup. Assuming there is one or many backups available, select one and click redo.

Good luck, the built in backup is notoriously unreliable (please use step 5, export the project and create an iwzip of every active project you have).

ok, thanks for your help.

have a nice day