Knowing how to avoid getting your ropes stuck, and how to deal with it when they do, is an important skill. This article gives some pointers to follow when abseiling to keep ropes pulling smoothly. Will Harris shares some methods of best practice and discusses techniques that can be used to retrieve stuck ropes.
I find that if I have to ascend a rope, for whatever reason, a mechanical device is so much easier than prusiks. Assuming two strands, a couple of micro traxions make short work of the ascent, and crucially is very smooth - reducing rope abrasion stress.
I agree a good article.
One additional point applies when threading the abseil ropes through a sling which rests against the rock. It's normaly best to have the pulling end underneath the sling with the free running end on top. The alternative will press the sling down and trap the (now not so) free running rope against the rock when the pulling end is loaded. I have seen situations where the rope has been impossible to retrieve from below in this situation.