I was experiencing a slight variation on this theme: I would open my browser, the game would load, and then a few seconds later the same game would reload (unless I was in the Your Puzzles section, when sometimes a different game would load). Plus sometimes I would create a new game, publish it, then discover I had actually created two different games with the same name -- one published and one not. This morning it occurred to me to try the old "F5" trick -- namely hitting the F5 key to reload Chihuahua so that the browser will play the most current version, not one in the cache. So far so good.
This also may or may not have anything to do with our adware detector finding some kind of downloader on the computer and deleting it not too long before I hit the F5 key.