Auria is the latest to release a crash prone update for existing customers. I personally didn't have any problems, but I heard from several folks yesterday who were less fortunate. Now it is official, as the update notes on Auria have changed to read:

What's new: Existing Auria users - please do not update to this version (1.03). We have identified an issue in this update that could cause issues during the update process. We have submitted an expedited update to Apple, and are waiting for approval. This new update will be 1.03a. NOTE: this does not affect new users, only users updating from a previous version.

This sort of thing is really unfortunate and can have lasting repercussions. Moog still gets a lot of anger from some corners of the web, for their crashing update. Currently Reddit's /r/iPad is nominating and voting on their favorite apps for many categories. When Animoog was nominated for the Music Creation category, it was immediately rejected by Redditor NudeTayne who stated:

"Great app. But the developers and support is horrendous. As an April Fools prank, they released a sound pack of fart sounds. It was funny, except they charged you for the the sound pack without warning it was a joke. No refunds App updates sometimes wipe all of your previous purchases. The 2nd to last update rendered animoog unusable. The app would not load until they put out a patch a week and a half later."

Some of those comments are a little unfair, but the sentiment is there.

As always though, if you rely on these apps in any serious way, be safe! Don't hit the Update All button without first waiting to hear if it is safe for your production environment.