We've set up AEM for one of our customers and we seem to have hit on a strange issue. It seems that in the authoring environment, pages fail to load completely sometimes... but the issue happens sporadically. It also seems to happen a lot more on their own network, although I will see the same phenomenon when I work on my local from time to time.
For example, if you try to edit a page, sometimes it won't load the Edit/Scaffolding/Developer/Design pulldown in the top right. Also no components on the page are editable. In another case, from the Site folder, if you open up the sites view from a subfolder, the subfolders will load but not the parent folders, and the "Loading" message still appears overlaid on top of the screen.
If you refresh the page that normally fixes it, but it happens often enough to be an annoyance for the customer.
I suspect that it is some kind of issue with their network -- I don't get this issue myself very often although it does happen occasionally. I suspect it is some ajax call or something to AEM which is timing out, but I'm not sure where to begin in terms of troubleshooting this issue.
If anyone has any clues or hints, it would be very much appreciated.