I am having the same problem.
Everything was just fine until I updated the plug in tonight.
Then it went vertical and with bullets in Firefox. still looks ok in Safari.
Seems to me to be a bug in the update, rather than a bug in all the users that did the update.
I deactivated the plug in. Not sure if to reactivate and do the fixes above or just use another plug in that does not require time and frustration just from doing a update.
