Thanks for giving feedback. Without it I cannot be sure wether it's running or not on the PRS650.
Maybe you will suffer non-functional seeming features: line-height, indent and margings. This features are functional but sometimes deserves user-tweaking:
Have a look at my long posting on page 243 concerning CSS-tags. If one or the other epub does not allow changing line-height ... add more CSS-tags to
database\system\PRSPlus\epub\CSS\extern.css
A.
PS: there is a new verion online since 30 minutes. It brings some enhancements.