scrambled images after alt/tab

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Function MakeForts()

	For i% = 1 To 4	
		White.Fort = New Fort
			White\FortX = i%*147
			White\FortY = 480
			White\Pic = CreateImage(64,64,1)
			SetBuffer ImageBuffer(White\Pic)
			DrawBlock FortPic,0,0
	Next
	setbuffer backbuffer()
End Function