Had that box checked in one identity but not the other. thanks for the reminder.

Running Pegasus ver 4.7 on Windows 10. Internet provider is Comcast. I got an email encouraging me to move to IMAP rather than POP. The instructions look simple, but before I do this I wanted 

to ask if anyone thinks this will create problems? 

Create problems?  No

I consider it a matter of preference though.  It should be easy enough to test to determine your preference provided your host doesn't requires some sort of either/or commitment.  To test, create the IMAP profile and disable the current POP3 host.  Live with IMAP for a little while.   It behaves differently from POP3 so I expect you will have questions which folks here should be able help with.  At some point you will give it a thumbs up or down.  If down, you can simply enable the POP3 host and stop using the IMAP profile.  Keep in mind that how your current POP3 configuration is set up will affect what messages are brought down should you return to POP3 (eg:  If download only unread messages is enabled then messages read with IMAP won't come down, at least I don't think they will).  Can you tell I prefer POP3? :-)

It looks like there are two advantages to me to switch to IMAP. First, I can synchronize across devices. Since I don't use other devices for email that is of little value. Second, POP only downloads a copy of the email on the ISP server. That leaves hundreds of emails on their server. Not sure if this is an advantage or disadvantage.  So for now I don't think I will change. 

FYI, deleting messages on the server once they are downloaded is an option configurable in your POP3 host.