I have the same problem. I created a new grid and used it in my shortcode:
[wp-tiles grids=”Test” post_type=”page” id=”19,28,807,33″ ]
However, it looks like a default grid is used:
A A
B C
D D
I also changed the Simple grid and used it but this has no effect. Removing and re-installing the plugin did not help either.
Resolved this for myself by removing all default Grids.
Still curious why this wasn’t working…