Some demos don't render anything at all.
I looked at the issues involved and found that changing xlib:display-force-output to xlib:display-finish-output solves most of them but one example. Both bounce and shove bounce depend on the definition of bounce-window. After changing display-force-output to display-finish-output i still had no drawing going on. After it dawned on me that the windows drawn are not meant to contain any content but they are supposed to jump around on my screen in some manner I saw the problem. https://termbin.com/j033
At this point, its probably better to rewrite the demos since outside the single function available in the package, most of the other demo's are non-functional.
Some demos don't render anything at all. I looked at the issues involved and found that changing xlib:display-force-output to xlib:display-finish-output solves most of them but one example. Both bounce and shove bounce depend on the definition of bounce-window. After changing display-force-output to display-finish-output i still had no drawing going on. After it dawned on me that the windows drawn are not meant to contain any content but they are supposed to jump around on my screen in some manner I saw the problem. https://termbin.com/j033