I asked for help about my spellcheck problem yesterday. Briefly this is that when the spellchecker hits a misspelt word it freezes, as does the message that is being checked. The only way I have found of reactivating Thunderbird is to shut down and reboot the PC. Spellcheck was working OK until a recent update, but don't know which one. christ1 responded with a query. I cannot find my original plea for help to reply to his query on the support site, and I cannot reply directly to the email notification of his request for further information. Hence this further thread. My response is this: I was on Thunderbird 68.8.1 but updated yesterday before posting my help request to 68.9.0. Problem still arises. Locale is UK. Language to be spell checked is UK English. Previously Thunderbird was on default US English, but yesterday installed UK English Dictionary (Marco Pinto). Again this did not cure problem.