I've been trying to get Jetpack 1.5 to work on a WP 3.4.1 site. I have it working on other sites.
I get this error (almost) every time I try to authorize it:
Your Jetpack has a glitch. Something went wrong that’s never supposed to happen. Guess you’re just lucky: no_state Try connecting again.
After deactivating it for a day, and then reactivating it, it came up with a new error:
Wrong size. Hm… it seems your Jetpack doesn’t quite fit. Have you lost weight? Click “Connect to WordPress.com” again to get your Jetpack adjusted. Error Details: Invalid authorization_code.
But I only saw that error the one time.
For what it's worth, the URL that was being generated on my side before it parses through to Jetpack was:
I then tried again to authorize, and it now reverts back to the original error, which it has been doing for a couple of days (since I installed it two days ago).