I realized accidently today that when you activate the checkbox "Mark files as new if dated less than" (under Projector > Site > Additional), the whole image display get locked and you get an empty screen, without button ... nothing
This is fully repeatable. An urgent fix will be welcomed .
This issue has been fixed with the new version 1.4.2 (thanks Laza for your reactivity).
... but I am afraid there has been a small regression: l just regenerate my album with the "new image" parameter changed to check the fix, and I found that the side menu is now hard to read due to low contrast; this is a problem I already reported earlier this year and was fixed in 1.3.1 on April 30th.
See attached screenshot for comparison between 1.4.0 and 1.4.2.
So I stepped back to v1.4.0.