I've been using Textwrangler for two years now from the time I bought my Mac, on Mavericks, Yosemite and now El Capitan. A couple of days ago it suddenly wouldnt launch - nothing happens, no error message. Looking in the system logs I can see the following: 17/02/2016 12:00:44.000 pm kernel: proc 3709: load code signature error 4 for file "TextWrangler" 17/02/2016 12:00:44.305 pm amfid: /Applications/TextWrangler.app/Contents/MacOS/TextWrangler signature not valid: 0xfffefa2a 17/02/2016 12:00:44.322 pm taskgated: killed com.barebones.textwrangler[pid 3709] because its use of the com.apple.developer.team-identifier entitlement is not allowed (error code -67063) 17/02/2016 12:00:44.322 pm com.apple.xpc.launchd: (com.barebones.textwrangler.6432) Service exited due to signal: Killed: 9 So, it would seem that overnight the app has suddenly become untrustworthy, if I read the messages right! There has been no update to the app and no updates to OSX during this period. Has anyone else had a similar problem with an app?