I come here with two questions:
1) I am trying to figure out the difference between 'checking a document out' in sharepoint 2013 vs just opening it and reading it. I THINK the difference is that if you open it, another user trying to open that same file gets 'file locked for editing' and the option to be notified when it's available or just get a read-only copy, vs checking out which means no one else can touch it until you actually check it back in. Is that essentially correct?
2) I have some users who are claiming that a document is read-only as soon as they open it, and they don't realize it until they go to save and are unable to do so (not sure if my 1st item and this one are related which is why I put them in one post). I am unable to recreate the issue myself but would appreciate any feedback....