Everything was working ok and now suddenly images are broken in some of our courses:
I have enabled slash arguments through the moodle interface as was suggested but this has not helped. Any help would be appreciated!
Agreed, slash argument does not always work... so the obvious question, what changed? These things do not just happen.... <span class="whisper">unless you are using a server from the Dark Side .</span> Who said that? mmm
There must be a reason for it to happen, so what happened? Track that down and you are likely to find out how to fix it.
In the meantime, try to relink the images and see what sort of success you have. If you can find a common thread then that would be a place to start.