I'm having some issues with IH4 on my site. It was working perfectly but for some reason now, she's broken. One category still displays in admin>tools>image handler4 but if I click one any of the other categories it comes up with this only:

Image Handler4
No Image Handler information found.
Image Manager Admin Tools Preview About/Help
Uninstall Image Handler. (Please backup your site and database first)
Clear image cache
Scan for old IH 0.x and 1.x original images

No mods were done in between it working as it should to now.

My work mate had added some images that were far too large, so I deleted all of them with filezilla and re uploaded drastically reduced ones.

I've emptied the cache and bmz_cache

But none of the above seemed to have worked.

The website is fabbedart.com.au - has anyone come across this before?