I've been trying to get the current location on my Nexus 5. When I click on the location button on the bottom right corner it keeps showing "waiting for location", but nothing happens. But it does work fine in Dalvik.
ART is still a work in progress and things may or may not work as expected. You can't do anything about except wait for the application's developer coming with a fix and/or wait for ART to be more stable.
ART is currently only included as an option so that developers can test their apps for compatibility, it doesn't offer benefits for normal people just running normal apps on their phones, quite the opposite in fact at the moment as many of them aren't compatible in their current version. There is a reason that the option to enable ART is hidden away in the hidden developer menu.