I just released the 3.8 version of the plugin.
As usual there are a great many changes, many of which affect how the plugin operates.
Please report immediately if there are any problems on your site so I can get a fix out.
The plugin is getting very large and complicated with many options. I have tested on my sites for two weeks without issue, but there are so many configurations out there that I can't be certain that I've found all the problems.