Good to hear you enjoyed the game.
I assume:
- you did not install URM
- did not use any mod
- did install the game into a new folder
- do not run it on any unofficial port (android, ...)
If any of the above, sorry, it might be incompatible.
Otherwise I am quite surprised, as this is a very basic issue and thousands of players should have run into it. Can you give some more details
- what OS are you running, what SJX version?
- is the issue reproducible?
- if so in which steps?
If you have a save game from which the error can be reliably reproduced and you know how to find the file you can send it to me (via MEGA etc.) for analysis.