Without any info, the only things I can tell you to try are the following:
1 - In your test, try pressing control and then walking. If that works, but you're otherwise frozen, you've probably just got an impassible tile.
2 - If 1 doesn't work, check the map's events, and see if there are any autorun events. If an autorun event is there, change it to parallel process. Autorun events stop you from doing anything else, and keep repeating themselves unless you turn on self-switches, so that's a likely cause of your problem