Running DNN 4.9.4... I have the same problem setting the value for the Search Results Module in the Group Details Module. I set it and hit update and it goes back to none.

Since there hasn't been any updates to this module in quite some time... Is there any support for this any more???

Hi Ash,

I Had the same issue, attempting to set the module setting via the db didn't work either. For the record, I tried:
 

declare @moduleID int, @groupSearchResultsTabId int
set @moduleID = 1314 -- replace with your group detail module id
set @groupSearchResultsTabId = 365 -- replace with your group search results tab id
select * from dbo.ModuleSettings where ModuleID= @moduleID and SettingName like '%tabid%'
update dbo.ModuleSettings set SettingValue = @groupSearchResultsTabId where ModuleID = @moduleID and SettingName = 'SearchResultsTabID'
INSERT INTO [ModuleSettings] ([ModuleID],[SettingName],[SettingValue]) VALUES (@moduleID, 'GroupSearchResultsTabID', @groupSearchResultsTabId)
 

The solution for me was to edit \DesktopModules\Smart-Thinker - UserGroup\UserGroupDetail.ascx and replace the two references to GroupSearchResultsTabID (one for category search, one for tags) with the tab id to my group search results page, hardcoding the result. ie:

Catgegory: NavigateUrl='<%# DotNetNuke.Common.Globals.NavigateURL(365, Null.NullString, "CID=" + Eval("CategoryID")) %>'
Tags: NavigateUrl='<%# DotNetNuke.Common.Globals.NavigateURL(365, Null.NullString, "S=" + Container.DataItem) %>'

Cheers,
Tim