sending email cannot read group addresses

I have been having this problem for a couple months now, originally thought it was my computer but we just had geek support check everything and the system is fine; so now to the program issue.  When sending a mail out to a group, program does not see any email addresses, but when I open the group up, in the email address bar, they are all there.  If I highlight them all, do a cut and re-paste, then it will read them.  What’s up with that?