[Bug-gnubg] GnuBG closed itself with warning.

[Mirori]

Sometimes, my gnuBG closed itself with warning when it returns from a 
screensaver.
The warning says,
"(gnubg.exe:3612): Gdk-WARNING ** [Invalid UTF-8] 
gdkdrawable-win32.c:gdk_win32_draw_rectangle:355: Rectangle failed" or 
"(gnubg.exe:1460): Gdk-WARNING ** [Invalid UTF-8] 
gdkdrawable-win32.c:blit_from_pixmap:789: BitBlt failed:".

It was not big problem to me, but I thought it might cause some bugs.

Thank you, 

Mirori