I just installed the latest version in DNN 4.3.6 and DNN 4.4.1, an I have to come back once more to a little issue that seems to become my favorite theme in this thread: recurring events and localization.
In the event detail view of an annually recurring event, not all date formats reflect changes of the locale. For example, in german locale, the date format is TT.MM.YYYY. Start and end date formats in the detail view are shown in this format when selecting german language, but not the recurring event date; this keeps the M/D/YYYY format. This has been an issue in the edit view as well, but there it has been fixed already.
I checked the formatting again in month/week/list views, but I didn't find any other date/time formatting issues. What I didn't check is the formatting in enrollment, notification and moderation pages/views, because I don't need these features for my purposes (and - sorry! - I was to lazy for this on this weekend - bright sunshine and spring like temperatures here in southern Germany!!). But perhaps someone else in Europe has a rainy day and wants to have a look at that?
But this issue is the only one left, at least as far as I can say. Anything else I have tested does work, and for me, the new version is definitely a great improvement! Congratulations!