Please post your URL, Username and Password in Secure Tab and i will take a look and maybe figure out what the problem is.
For posting sensitive information you hit the Blue Reply Button and then you will see Secure Tab. Post all info that is sensitive in there, only Fellow Mods, Staff and I can see that!
Tanya - sorry for the delay in your receiving a reply. Ricochet is a Gantry 4 template, so you don't need Gantry 5 installed (I've now uninstalled it). You have Gantry 4.1.29 installed which is way out of date - so I have now updated it to Gantry 4.1.40 for you and now template manager works again.
Regards, Mark.
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information.