I had exactly the same problem (blank screen, no admin panel).
Had to restore the previous version …
I also was very happy (on the beginning) with that plugin … and had bought all the options and complementary plugins … to finally pass the more of my time trying to solve myself a lot of problems found while trying to use them on a professional site.
Supports is quite inexistent, and UD website is almost always down !
Same problem for me ! 🙁
Unfortunately this is not an exception WPP, WP-CRM and WPI are full of bugs … and the support is almost inexistent (you’ll get fast responses if your question is banal … but if you find a bug – and for sure you’ll find – do not hurry to have a fix !)
SHAME
Thanks for the tip : the problem is solved (flueto sucks !)