In my case it was "News Item" on front page. It was working fine with 1.9.x but after up grading to 2.2 there were no block in left right columns. Dock was working fine to show blocks but in pre and post content section there were not visible. Spent hours to find the solution
Blocks
Front page blocks are invisible in Internet Explorer
Keskustelu on lukittu, joten et voi enää vastata siihen.