@SimonWoods @pratik One thing that's not obvious... Auto-complete only works at the end of a post currently. Might be something like that interfering rather than the Mac dock feature specifically.
@help @SimonWoods Yup. That was it. So I must first mention all the people and then type in the reply.
@pratik Glad that was it. We'll lift this limitation after I'm positive we've got all the other bugs worked out. (Trying very hard not to introduce new bugs!)