So far it's looking good so it looks like there will be no big hit on MORL.
Frankly I don't know what the BREXIT has to do with REITs but the weak willed stockholders among us will all run for the door.
MORL is a low volume trading stock. Could it be you are just seeing the lack of trading for certain brief periods?
Neither your broker nor UBS know what the dividend will be yet since they haven't calculated it yet.
Correct me if I'm wrong but if the dividends are received in an IRA, the issue of Qualified or Unqualified does not matter.