Sharepoint Online - Content Search, some Display Templates missing.

Question

I'm experimenting Content Search web parts in a number of Site Collections, but appear to be getting different Display Templates available.
Can anyone explain what controls the availability of the templates please...
Our Default root site collection.
http://company.sharepoint.com
Has Web part controls of
List & Slideshow
And Item Templates of
Large Picture, Picture on left 3 lines, Recommended Items & Video
All other site collections  http://company.sharepoint.com/sites/Dept1
Has Web part controls of List
& Slideshow
PLUS List with Paging
And Item Templates of
Large Picture, Picture on left 3 lines, Recommended Items & Video
PLUS Diagnostic, Picture on Top 3 Lines bottom, & Two Lines
I've compared site and collection features and cannot see any features that would appear to control this...
Any ideas.... Please!
Cheers
Russ

Answer 1

I just had the same issue, I think it was something with broken upgrade code from 2013.
Anyways, I solved it:
Go to Master Page Gallery --> Display Templates --> Content Web Parts
Delete all JavaScript Files in there except the Group_Content.js (!!!), they seem to have messed up metadata (Content Type Reference and Template Level)
Open up PowerShell and issue this command:
Get-SPFeature SearchTemplatesandResources | Enable-SPFeature -Url [URLtoBrokenSite] -Force
This will re-upload the JavaScript files and all controls and templates finally are there again, hopefully ;)
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