Weird Mail Thing

[jazzer15]

I have a late 2015 27" iMac i7, 512GB SSD, M395 and noticed something a little strange with my Apple mail program. When I hit "reply" to an email sometimes there is a slight pause and the background to the dock changes from a darker grey to a light gray and then back again momentarily before the reply window opens up.

Has anybody else seen this behavior? Is it normal?

 

[maflynn]

I've not noticed it, but from the symptoms you mention, I'd go out on a limb and say it was a bug in El Cap.

 

[jazzer15]

Thanks. On further investigation, that seems to be the case. It appears that my wife's older iMac running El Cap. sometimes does the same thing. The other thing I noticed is that that the reply window opens differently at different times. Sometimes it just pops open and other times it has an "animated" - genie like effect (for lack os a better explanation) on opening. It's not consistent in what it does.