Stuck in this one page
Cannot get out of Calendar task section
I would suggest to open the Windows or Mac task manager and close eM Client task.
If it still happens, reboot your pc incase its something currently in memory interferring with the program.
If rebooting your pc doesn’t help, uninstall eM Client and “don’t delete the database” on uninstall when asked. Then download the latest version of eM Client from the version history page and reinstall the program.
Note:- If that then all works ok, make a backup of eM Client via “Menu / Backup”. or alt setup automatic backups via “Menu / Settings / Backup”.