If you goto Realms, Realms tells us it is not compatible, and consider updating. While you should be abled to join ANY server with 1.8.1(-pre1). That means in Realms too.
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In 1.8.1-pre2 the Realms world selection pops up, but when trying to connect I get
[20:00:08] [Client thread/INFO]: Realms library version == 1.7
[20:00:10] [MCO Availability Checker #1/INFO]: Realms is available for this user
[20:01:44] [Realms-connect-task/ERROR]: Couldn't connect to world
java.lang.NullPointerException
at dax.run(SourceFile:38) [1.8.1-pre2.jar:?]
Perhaps I'm wrong, but wouldn't this be WAI? Because I remember snapshots and prereleases aren't usually supported by Realms and Realms has always been strict with version numbers(In my experience atleast)
Ow btw. The splash was from the Resourcepack I just disabled. I don't know if that bug is reported yet.