Critical Bug: System.InvalidCastException (Int32 to Int64) during IMAP Sync - Version 10.4.4756

Hi, yes, let’s get more logs please:

  1. Export your account to a xml file via Menu > File > Export.
  2. Launch eM Client in Offline Mode: when the splash screen opens, hold Ctrl and confirm that you want to open in Offline Mode.
  3. Import the account from the xml file (Menu > File > Import).
  4. Go to Menu > Settings > Advanced .
  5. Enable logging for IMAP for the account.
  6. Close eM Client and open it in Offline Mode again.
  7. Turn the mode off (click Offline at the top).
  8. Wait for the error.
  9. Go to Help > Open Log Directory in the menu.
  10. Send the files from the folder either to [email protected] or here via DMs