Diablo III Patch 1.0.7a is Live
Hotfix details and new bug fixes are all rolled into a small client update

The patch details, from the client patch notes:
Diablo III Patch 1.0.7a - v1.0.7.15295
Classes
Classes
- Wizard
- Bug Fixes
- Fixed an issue introduced in 1.0.7 that caused: Archon Disintegration Wave, Disintegrate, Energy Twister, Meteor and Ray of Frost to grant double the amount of Arcane Power when Arcane Power on Crit triggered
- Bug Fixes
- The Enchantress should no longer sometimes cause an error to occur after casting Focused Mind
- Bug Fixes
- Players are no longer prevented from progressing when another player joins or leaves the game during the "A Royal Audience: Talk to Asheara at the Gates of Caldeum" quest step
- Fixed several issues that could cause crashes to occur
- Players will no longer be killed by DoT damage after zoning out of Scorched Chapel
- The Siege Breaker Assault Beast and The Savage Behemoth will no longer reflect damage from pets
Although it was not mentioned in the patch notes, this client update presumably also fixes the constant Auction House errors 0 and 31048, which had been listed as requiring a fast patch client update to fix.
This client update takes care of some lingering issues brought about with patch 1.0.7, and provides another step along the way in the Patch 1.0.8 Timeline.
Update March 14: The official patch notes are live for Patch 1.0.7a. Also, as surmised above, this patch did fix part of the recent Auction House errors. At this time, more work is being done to finish taking care of those issues.