Need help on setting up a new user role and group

Hi,
At the moment, MODX is so strong that if any unskilled editor/programmer can make a mistake losing their password or leaving the file system vulnerable. So, I want to create new editor group and user to only manage certain contexts, also limit their file/media source usage.
I have followed this guide: http://bobsguides.com/creating-manager-users.html
Currently I can login mgr context, but when I visit the frontend which is web and web1 contexts they're just not available, I got error: 404 not found, the site is available when I log out the editor account.
After that, I've tried adding some other ACLs for web and web1 contexts (and assigned Editor role and Editor policy to them) but still no luck.
However, I've not edited any policy of Administrator group or Administration Policy. This is kind of weird since I've not seen this before. Caches are cleared and I've flushed all sessions after doing ACL update.

Any help would be appreciated.

Well, maybe I'll try again with other solution though.

Do the front-end contexts require login? If so, when previewing them from the Manager, you're not logged in in the front end.

If they don't require login, remove any Resource Group Access ACL entries with a context of web or web1.