For compatibility with applications that require plain-text, you must update your system preferences using the following procedure. Please not that it is not sufficient to just tell Mail to compose in Plain Text.
Open "System Preferences"
Select "Keyboard"
Select "Text" tab
Un-check "Use smart quotes and dashes"
Show Macintosh recovery partition in Startup Manager
Run these 2 commands in a terminal.
diskutil cs list
diskutil coreStorage revert lvUUID (where lvUUID is the last lvUUID reported by the previous Terminal command)
Then restart for everything to get back to normal after you have run these commands in Terminal, and the recovery partition will show up again in the startup manager when you boot up with the option key.