Here's your answer. It's a simple matter of deleting part of the saved game.The savegame.HDR holds all the data about your game and characters. The savegame.MM9 holds data about the current map.
To fix your stuck-in-the-wall problem. Do this -
Save the game and quit. Let's call the save Imstuck.
Find the saved game folder with explorer and delete Imstuck.MM9. Do not mess with Imstuck.HDR.
Restart the game and reload Imstuck. The save will load but the game will have to rebuild the current map. So, you'll be back at the beginning of the current map.