Beta 3 is out one day after beta 2. Download the installer from the usual place. Changes compared to beta 2:
Improved fix for a bug where thumbnails would not be able to have their
checkmark set on or off with the mouse on recent versions of Qt. The fix in
0.9.19b2 did not always work. The environment variable RPD_THUMBNAIL_MARK_FIX
introduced in 0.9.19b2 is no longer needed, and will be ignored.
Fixed bug #1842060: Wrong value saved for stored number.
Updated Czech, Dutch, French, and Spanish translations.
If you have not read the beta 2 announcment, I recommend reading it, as it contains many more changes.