Hi, as the topic title states this happens in 2.03 and I encountered it in 2.02 again before.
Just an update, it appears that when this happens if you manually click save when in the middle of nowhere and not able to move, then you exit the game, restart it, load and appear in the map somewhere and can move again. Managed to do this and get my TCS achievement.
As a side not, if trying to replicate it you may want to try copying the game saves folder. I have been moving the folder from the desktop to my laptop because I was traveling and wanted to continue in the meantime. This weekend I played a whole TCS from start to finish on one system and never encountered the error, that's why.
In short, if anyone encounters this, too, then: manually save your game through the menu, exit the game, restart, load and should be ok.
Sheverad's post in [TWM 2.03] Traveling to a location and landing in invalid entrance, can't move! was marked as the answer