I have just updated the plugin to 2.4.11
When I try test to send a newsletter, I have a new problem (quite new: I must say since last time I tried, there are many more things that changed on my site under developmnet, so I can't be sure it is the plugin update that triggered this problem)!
I do every step as in your video, but when I click 'create list of recipients' I get the lightbox open without any styling, and none of the links (test, send, ...) works.
See shot (I can provide access to admin if you mail me at agnes.lesage @ gmail etc).
I saw somewhere else there is an issue with lightbox...?
I use a theme that has prettyPhoto embedded for lightbowx functions, not sure if it can be a problem?
What else may I check or try?