Hi all. I have been using thunderbird for many years and it has been perfectly fine on the whole. over recent weeks I have noticed that when I reply to an email the small reply arrow that proceeds the subject line sometimes does not appear at all, sometimes it appears and disappears after a few seconds, most times it appears and then will disappear when I go away from, and then return to, the folder. Older emails are not affected and still have the reply status displayed. Also. . . .strangely the odd email will retain it's arrow though I do not see a pattern why they should in any way be different to others! So far I have run in safe mode and it makes no difference, re-made the global index file and it makes no difference. I also made a new profile and still the same issue. I don't run many addins and have tried disabling them all and it makes no difference. The emails are IMAP configuration. Has anyone got any suggestions??