Can't add block in a region I'm using a Drupal 7 version website and I'm trying to add a block to a region, when I go in blocks and try to add the block to the region and I do save it reply me that it has been saved but no block is been placed in that region. I'm using omega 4 theme module.
 Anyone knows on how I can solve this issue ?

Many thanks to all.
I had a similar issue. But I had Bean and Bean-all module installed, so only in the blocks ticked in admin/config/system/bean-all the move/edit actions were "real" or commited, although success message was showed in the non-ticked ones.