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Sorry if this is a report of some sort, I am new and just started poking around with VASSAL last night trying to learn it.
I currently am working with the Game of thrones module and I have an issue to report, if anyone else has experienced this and fixed it please inform us all.

I have a screenshot of what I see
imgur.com/ONSi3Y0

If anyone has a fix to this problem please let me know, I am not the only one dealing with it either.
If you ask me i think it has somethign to do with the versions vassal.

I have reistalled the latest version of vassal but it didnt work.

Any help would be appreciated.

Sincerely,
Piv

I had the same issue. Fixed it by upgrading to 3.2.4 and clearing the tile cache. Tools> Clear Tile Cache. This menu item is before you run a module.