I would like to comment that I have the same issue and deleting the plugin did work. I would also like to report that my WordPress dashboard does not indicate that there is an update available for the UM (currently says 1.2.1), even though the link to the plugin site says 1.2.2 is available.
Furthermore, I noticed that my WPSSO plugin was updated last night, an update I did not initiate. I then looked at my Jetpack settings and noticed that autoupdates were enabled for WPSSO, but the UM can’t be autoupdated by Jetpack, and this is an absolute recipe for disaster. I would not be surprised if more people come up with this issue.