Let's see here, so as of the latest release we have:

• Sideboard building (8+ cards) has been unusable for over a week? Yep.
• Vivi Ornitier still isn't banned in Standard? Yep.
• Multiple odd networking, queuing, and sound bugs? Yep.
• Multiple confirmed long-standing card bugs (e.g. Lightwheel Enhancements)? Yep.

ZERO communication from WotC on ANY of this? Yep.

Ok, time to put Arena on the shelf for a few months until WotC can (hopefully) get its act together as a software publisher.