New in 4.0.1: ePub contents pane no longer navigates to the correct page/section when clicked on. Still worked fine in last beta. (Though not new in DT4, having a navigable ToC for ePubs in a sidebar has long been one of my favourite features of DT Server, and one of the reasons I generally prefer it to dedicated ePub readers.)
Just noticed, but also there in last beta: sorting by date on the Modified column is upside-down (latest-to-earliest and earliest-to-latest each do the opposite); and sorting by Size appears to be alphabetical rather than numeric. (Name and Kind work correctly.)
For anyone who isn’t @aedwards reading this and who hasn’t yet upgraded from the beta or is on the trial version, this is your last call to check out the upgraded Server functionality in DT4 while it’s still unlocked for you; it’s always been one of the crown jewels in the DEVONtech portfolio, and the new version is phenomenal.