happy.melon.wiki wrote:

Usergroups should be lowercase and without spaces: replace "Dev Team" with 'devteam' and create [[MediaWiki:Group-devteam]] with the name you want to give it. See if that fixes anything.

tim wrote:

Here's what worked:

• I changed to "devteam", and now I can save the Special:UserRights page.
• The permissions work as expected ("Dev" namespace is restricted accordingly.")

Here's what still doesn't work:

• I added the MediaWiki:Groups-devteam page, but the text "devteam" still shows. Frankly this is zero impact to me, so not problem.
• On Special:UserRights, I still see these selections (why!?)
  • nsDevRW
  • nsDevRO
  • nsDev_talkRW
  • nsDev_talkRO

Those four selections are really quite confusing to me. (I don't want someone to accidentally select one and cause an error.) From where is this list populated? Is there data in the database somewhere (obvious tables didn't lead me to anything)?

tim wrote:

It looks like those "odd" entries come from the NamespacePermissions extension, but that's odd because I don't remember them from 1.15. I'm quite sure they WEREN'T there.

From http://www.mediawiki.org/wiki/Extension:NamespacePermissions

e.g. nsFoo_talkRW, nsFooRO. These groups are for granting permission to one existing user at a time; the extension causes them to appear on the Special:Userrights page. The extension provides the above pair of groups for each extra namespace you defined in $wgExtraNamespaces.

I commented out these lines from the extension, and everything works fine:

$wgGroupPermissions[ "ns{$title}RW" ][ "ns{$num}_edit" ] = true;
$wgGroupPermissions[ "ns{$title}RW" ][ "ns{$num}_read" ] = true;
$wgGroupPermissions[ "ns{$title}RW" ][ "ns{$num}_create" ] = true;
$wgGroupPermissions[ "ns{$title}RW" ][ "ns{$num}_move" ] = true;
$wgGroupPermissions[ "ns{$title}RO" ][ "ns{$num}_read" ] = true;

I didn't have to do this from 1.15, but whatever... maybe things have changed from my previous wiki (I no longer have access to it because I'm at a different place now, so unfortunately I cannot compare these things).

I guess there are no problems.