For more details see this forum post:
The test that has been screenshotted has send an @ via system.windows.forms.sendkeys.sendwait (works correctly)
Then it tries to send the same symbol via keyboard.sendkeys (works incorrectly).
Then it retries via system.windows.forms.sendkeys.sendwait (also works incorrectly).
This is demonstrating they keyboard.sendkeys mangling something inside.
This does not happen with vs2010.
It requires you to not be using a US keyboard layout.