@Gary It sounds like deja vu to me. In the end, didn’t eM Client roll out a fix in a future version of eM Client? 
BTW, in this scenario it’s odd because 3 out of 5 Outlook (Hotmail) accounts are fine but two are not. In other words,. I’m experiencing the same issue as OP. I have some Costco popcorn ready to see how this movie ends.