Bug: "Show guides..." preferences do not "stick"

Under Preferences, Rulers, the following items, when checked, do not retain their checked status after exiting and reopening the program:

"Show guides at object center"

and

"Show guides at object edges"

I have tested this for hours—using different (new) accounts, deleting and reinstalling Pages 5, and purging plist and caches (both user and global)—and have also confirmed the bug with an Apple technician (he has the exact same problem).

This looks like it might be a bona fide bug.

Is anyone else seeing (and can confirm) this behavior?

Thanks!