XSLT not working on 7.3.6 upgrade (Cannot use this obsoleted overload when the current provider is not of type )

Questions
1

Hi,

I upgraded from 6 to 7.1.2. All worked ok.
Upgraded to 7.3.6 which seemed to work but none of the XSLT seems to load with the following error.

Error loading XSLT FILENAME.xslt. Exception: System.InvalidOperationException: Cannot use this obsoleted overload when the current provider is not of type Umbraco.Core.Cache.HttpRuntimeCacheProvider

The rest of the site seems ot function ok.
I followed the version specific and individual upgrade guides.

Any ideas?

Thanks

DT

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/74681-xslt-not-working-on-736-upgrade-cannot-use-this-obsoleted-overload-when-the-current-provider-is-not-of-type