Saved log files (*.dblog) cannot be opened when "Auto Newline" flag is disabled from Options menu. To reproduce:

• Have some logs on screen. Save them to a .dblog file via "File > Save Log" command.
• Make sure "Options > Auto Newline" menu item is not checked.
• Try to load the saved file by double-clicking it in the file manager or by using "File > Open" command.

The application will treat the incoming data as a single-line message and try to cram all the contents into the first line. Sometimes nothing will happen, sometimes a single line containing all the messages will be shown. If the log file is very big, the application will probably hang.

Edit: Tested with the AppVeyor head version, which should be e2c804b or 395d3a9