Image Handler 4 (for v1.5.x) Support Thread

[OLCS]

Hi,

I wonder if anyone can help.

I am using Image Handler 4 and Zen Lightbox. Up until recently Image Handler 4 worked fine however, now when I upload images it seems to fail to create medium and large images correctly. Therfore my product info pages have no image displayed. I have discovered that the product info pages are looking for an image to be in images/medium/category/image_name_MED.jpg. Unfortunately the file doesn't get created in this location, hence wy it's not displayed. Has anyone seen this behaviour before and could therefore point me in the right direction for a fix?

I am using Zen Cart v1.5

A link to a product page in question is here

Would be very grateful for any help anyone can give

Many thanks