Hi,
I am guessing my issue is related to Drupal upgrade, as I am unable to pinpoint to anything particular.
I probably didn't follow all of the guidelines for upgrade. My bad, but the process to update anything is so complicated and time consuming, one tends to take a shot at shorter route :( e.g. If I have to reinstall a module, I need to first disable the grandchild of it (modules using the modules which use this module), then the child module, and then this module. In all this, one has to bear with the slow pace of module refresh page, and then he also has to remember what all he disabled and in which order, to be able to reverse the process correctly.
Anyway, now that I have done my share of bad, I am ready to pay for it by debugging what is going wrong. But I would request some pointers in that.
Symptoms of the problem are these:
1) Sometimes when I go to my homepage (front), I get an error saying cannot redeclare node_page_edit in node.pages.inc on line 16 as it has been already declared on line 13
2) The blocks which were configured earlier to show in some particular region, continue to show in that region even if I rearrange
3) Any new configuration that I do for an old block or a new block to display on a node, that doesn't work. Node just comes empty.