When the character i is typed in the Compose window, either the Subject line or in the body of the message, the Help window opens. Close the Help window and type the i again and it displays correctly without interference from the Help window. This behavior started when I changed keyboards to Cherry G81-1800LPMUS-0/01. I switched to Sylpheed for my MUA and have used it without this problem for several months. I would like to change back to Claws Mail for other reasons but this behavior is unacceptable.
To things to try: 1. Upgrade to the latest release: 3.11.1 If that doesn't change anything ... 2. Go to /Configuration/Preferences/Other/Miscellaneous, click 'Choose preset keyboard shortcuts', then with 'Default' selected, click OK. Re-open this bug report if it still occurs after having tried both the above.