Image resize timeout - new images were not created

[reed]

Hey all - 

I've got a new question concerning the image resize timeout discussed here:

https://processwire.com/talk/topic/3718-lots-of-images-to-resize-timeout-in-frontend/

https://processwire.com/talk/topic/7744-image-width-function-timeout/

But the problem I've run into is that when the timeout occurs, it corrupts or doesn't properly build the resized images. I need a way to force the resize to run again, preferably just for the damaged/missing images. 

You can see an example of the missing images here: http://arthistoryproject.com/artists/ferdinand-hodler/ - scroll down in the right and check "Autumn Evening" - the image name has been created, but the file is broken

Any ideas? 

Thanks so much!