The map you retrieve from the corpse of the man with a tree on his head, where exactly is that treasure located I have found several areas that seem to match the picture on the treasure map but have yet to find any treasure

It's probably a bug - you will not be able to find a chest. Some (most? all???) of the chests for the Treasure Maps have disappeared as of patch 1.2. I don't know if they were there before that patch, I did not look until 1.2. One of the maps is one found in a fort and the chest should be nearby. I spent quite a bit of time looking for it, then consulted the Game Guide. I found a spot that looked just like the one in the photo, and matched the location on the map, but no chest. I finally went to the PC Hardware, Software, etc. Issues and the unofficial bug reports thread listed the missing chests as a bug.

I'm not having any issues with the treasure maps at all (yes, patched 1.2 on PC). I've successfully located maps 4, 7 and 10 since the patch. I have 3 and 8 in inventory, haven't taken the time to go looking yet....

I think mine are still messed up. i have map 1 plus a couple others, I went looking for the chest for map 1 after the 1.3 patch, and just couldn't find it.

It shouldn't be difficult. It's near Riverwood, by the river bank.

Is 1.3 available for PC? I haven't a clue....

Yeah, it went live on Steam a couple days ago.