When it comes to plugins for Wordpress, the best thing to do is to turn to the support from the developer. You can also do a search for the issue at the Wordpress.org forums.
I did a search there and see different threads that deal with the same issue. It appears to be caused by different things, so you will need to read the different ones and find the thread that best suits your situation.
We did try it here with our test version without issue, so it may be some settings. Again, check the forums at Wordpress and the developer site to be certain.
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