Hello Ian,
some thoughts:
> unlike file operations where ignoring an error could be a disaster
Perhaps you can save your logged /LQ session via Alt-Z, Alt-Z, y
and restart ZTree without /LQ which reloads the tree (incl. unlogged dirs),
but now ZTree does not suppress errors when you do file operations.
> If I wanted to find all the files and folders to which permission is denied ...
For directories that are not logged, you could use the key combo Shift-PgUp/PgDn.
Do you know it? In the Tree window it jumps to the next/prev unlogged dir.
The 'permission denied' should then be displayed in the SFW (if CO-3P "Bypasses Small File Window" is =No).
But be aware of ZNOLOG.INI - the dirs/branches specified in it are excluded from logging via *.
To skip the ZNOLOG.INI influence, you may use Alt-Log [U]nlogged branches. See ZNOLOG.INI.
Hartmut