Graphical glitch in main menu after quitting a game

[JAsmine-ja2 NA]

There is a graphical glitch on the main menu screen:

This is how to reproduce:

1. Start a new game or load a game
2. End the current game and go back to main menu
3. The glitch will be there

More info:

• This does not work with standard resolution (640x480)
• I can reproduce this in both 800x600 and 1024x768
• This issue is not present in vanilla JA2 (because you can't change res there)
• The screen looks fine when starting JA2. It gets messed up only after exiting a game
• This issueis present in v0.12.258-win, but was already there before