As an administrator I can (pre)view an unpublished resource just fine, a new tab opens with the edited page. But an editor user gets a 404, although the friendly url is showing in de url bar. I think I gave the user all the right permissions.
Any ideas?
It sure sounds like a permissions problem. The editor would have to have "view_unpublished" permission in a Context Access ACL entry for the 'web' context.
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PLEASE, PLEASE specify the version of MODX you are using.
MODX info for everyone:
http://bobsguides.com/modx.html
Ah, needed to add the editor to the web context. Thanks Bob!