Related Items Extended show incorrectly on menu items

It seems the module doesn't show at all now on the menu items (which is fine by me, but isn't the behaviour it previously had), and shows no error messages on the article pages, as far as I can see.

There is another problem, however, and it is that some images do not show properly. Have a look at this page: ehinger.nu/undervisning/kurser/kemi-1/le...kemisk-bindning.html Under "Trendar just nu" to the left, you can find a link to an article named "En introduktion till hybridiseringsteori". The image is broken, but in the linked article ehinger.nu/undervisning/starta-har/nyhet...idiseringsteori.html the image shows up all right. (This appears on several other pages, as well.)

Perhaps I only need to clear Related Item Extended's cache or something?

The previous behaviour was that related items were shown for all pages on my site, including both menu items (e.g. ehinger.nu/undervisning/kurser/kemi-1/le...kemisk-bindning.html) and articles (e.g. ehinger.nu/undervisning/kurser/kemi-1/le...kemisk-bindning.html)

Yes, the thumbnails showed correctly before. If I right-click on some of the correct thumbnails and select "Show image", the correct image in the cache is shown. But if I right-click on one of the broken thumbnails, I'm just directed to "ehinger.nu/undervisning".

OK, I removed all the images in the cache folder, but thumbnails still don't show properly.

Yes, quite sure, because the first image in the article is with a width & height set to 0 (simply because I didn't want the image to show, or the wrapper used to make captions for the images in the article prevented Related Items Extended to make proper thumbnails).