I have compiled the latest version of ykhwong build of dosbox lately.
There is strange thing happening, when I start games like tubworld, or Windows 95
I only got half the screen, the lower half falls below the bottom of the display.

I compiled another version before. The only difference is the new one has double scaneffect enabled
and the old one has no double scaneffect, why half of the screen is gone?
Any ideas?
Thanks
Jack