Using ImageMaps 0.4.3 on 1.13 CraftBukkit version git-Bukkit-49a2604. Images remaining from the previous server version display properly, but new images don't. The /imagemap (file) true command works and there are no errors in the console, but the displayed image appears to be an image of an item frame (one per block) or maybe they're item frames in item frames.

I hope you're still maintaining this plugin and can update it.

Works now. Thanks!

I pushed a 0.4.4 version that should fix it.