I jumped through all the hoops and installed the standard version (2.04)in mid April. Today, May 1, 2014 I noticed an update to 2.06 was available. I checked to see if the new version had been tested on WP 3.9, it all looked good, so I auto updated and crashed the site, (a blank white screen).
I had a backup copy of the site. I uploaded the most recent plugin folder and the site was backup and running.
I really like the plugin and I see that most others are not having a problem with the new version. I am happy for them, but at the same time almost hope they find a glitch someplace, so I can feel at ease at some time in the future about trying to update again.