Beta 4 Fix
I have just created a fixed version of this library! Lot's of people have been asking about how to get it to work, so I figured I'd update it since hacheipe found a fix that only takes five minutes to do. This update implements their fix. Credit to them for figuring it out. It also directly uses the images SMBX loads into memory instead of loading copies from the level folder. So, dummy block images will no longer be rendered, ever, and the folder that used to come with the library is no longer included. The ugly seams that appear in the effect render have also been fixed.
It is recommended that you use this in Beta 4, but it should still work on older betas and preview builds.
Video:
Do not do any of the dirty tricks shown in this video unless you want the people who play your levels to hate you.