I’m having a similar, but not as severe problem. I upgraded to WP 4.1, then to Jetpack 3.3. My site kept running, but I could not access the admin pages (blank page, no error).
I downloaded 3.2.1 and installed it, which gave me back the Dashboard and amdmin menu, but many of the admin pages came back blank (e.g. posts, pages, themes).
I downloaded 3.2 and installed it, which gave me back the Dashboard and amdmin menu, but many of the admin pages came back blank (e.g. posts, pages, themes).
I downloaded 3.1 and installed it, and everything seems to be working now
On another site I run, I’m able to run WP 4.1 and JP 3.3 with no problems.