If you have a number of autorun events, I would question what they are for and why you have made them that way. Autorun events stop the player from doing ANYTHING (including turning, so if you can turn, it's not because of the autorun events), and you should really only have ONE of those, at most, active at a time - and it should delete itself or turn itself off after running.
There are a couple of possibilities.
As Andar said, it could be passability issues on your tileset. You might have changed an O tile to an X tile in the passage settings. Or you might have used a blank tile from the B-E sheets with an X setting to 'erase' tiles you didn't want after drawing them. The top left tile in the B tileset is the only correct 'erase' tile, and its passage setting should be a star. So check that too.
The other thing could be, if you do have events around where your player character is, if they are set to Same as Characters for priority, they will stop the player moving through, even if there's no image on the event.