Really? I've used it on countless sites and am currently using it on about 7 sites (all WordPress 3.7.1) without the slightest hint of a problem. On at least 2 sites, I've been using it for years through multiple WordPress upgrades & it's always worked perfectly. It's also very well maintained with an excellent record of compatibility with the current version of WordPress.
Downgrading WordPress is NOT a valid solution and is, in fact, a pretty daft thing to do. Were you aware that a 3.6.1 site is running a very real risk of being hacked?
Where people do encounter issues, they are invariably site, server and/or user specific. However, given the sheer number of people attempting to post in this topic, it is no longer possible to see if there are any common issues here.
I suggest you all post your own topics if you want to receive effective help. Given the current state of this topic, I am now closing it.