Joe Rossignol, writing for MacRumors:
A growing number of MacRumors readers and Twitter users have been experiencing an issue with some Mac App Store apps displaying a “damaged” error when opened since late Wednesday. The issue appears to be rather widespread, affecting popular apps such as 1Password, Acorn, Byword, Call of Duty 2, DaisyDisk and Tweetbot.
I’ve experienced this first-hand, albeit without the “damaged” dialog. Tweetbot was running fine on my El Capitan Mac. But when I quit it and relaunched, I was prompted to re-enter my AppleID password. Hopefully, this gets resolved quickly.
Me too. Tweetbot only and needed to supply AppleID password.
I had to reinstall Byword, Dash, Deckset, iFlicks, Paprika, and Reeder. Not everything. Odd.
Luckily I have CleanMyMac & 1Password which made the whole process painless.
When using Screeny app this morning, it only asked for my iCloud login info before start using the app. After that, it worked fine. Weird.
Reinstall fixed it for me. Frankly, less effort than restarting. 🙂
I launched Tweetbot in OS X Yosemite around an hour ago and had no problems. This machine has been running for a few days with no reboots (just sleep), so whatever happened may be fixed now.