Tuftmeister

I sorted it out myself, thanks for the distinct lack of help.

…thanks for the help there.

Not.

Thanks, I just checked and wp-content/uploads/ is set as follows:

drwxrwx–x 0771

Do those permissions need changing?

What if you deactivate ALL plugins…

I’ve already done that, see my OP.

…and switch to an unmodified default theme?

Nope, no change – still broken image icons.

I’ve tried .png, .jpeg and .tff – they’re all the same, they all show the broken image icon.