Messages on MBP sends letters that AlTeRnAtE lIkE sO bEtWeEn UpPeR aNd LoWeRcAsE

Messages on my MBP (El Capitan 10.11.6) appear normal when typed. When sent, letters AlTeRnAtE lIkE sO between upper and lowercase. This doesn't happen on my phone, just on MacOS. Similar bug linked to iOS? mine is 10.3.3, iPhone 5(c?)

MacBook Pro (15-inch Mid 2012), OS X El Capitan (10.11.1), 16 GB 1600 MHz, NVIDIA GeForce 1GB
Has invited:

howapple - hello

Favor from:


With Messages open go to Preferences and the General pane.

Turn Off the Mix Case AppleScript option.








8:42 pm      Wednesday; January 24, 2018


  iMac 2.5Ghz i5 2011 (Sierra)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 iPhone 6 iOS 11.x and an iPad (2)

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