The main playlist send-to menu might crash for some especially if it involved a large active selection.
Dragging a selection the results pane of a local library view may crash depending on the target window.
The shuffle table may not act as expected (especially if viewing the diagnostic page) causing it to internally reset during playback after dropping items onto the main playlist. This was also present in the 216x2 builds & possibly 215xx & is still be replicated directly to be able resolve it. This should not be causing an crashes.
The natively provided output plug-in preference pages may either disappear or show as not being accessible depending on how the preferences vs playback have been triggered due to some loading optimisations introduced in the beta builds over the prior 2 months. Restarting WACUP will get them to appear again once but a full fix will require a new release.