wxColourDialog on the Mac, returning zeros for RGB values, anyone else noticed any issues?

Using wx 3.3.0 on MacOS (latest).

The dialog appears ok, and when I get the colour from the dialog, IsOK 
returns true on it. But calls to GetRed etc all return zero.

Also tried wxGetColourFromUser, that's behaving the same way for me.

Strangely, it works fine when called from a different dialog.

Anyone else experienced anything strange like this?

Thanks in advance,

Tony.

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