Hi @t-saito,
No major changes were made to that service but if we were to make such changes, the API clients code would have changed accordingly and KMC would have worked:)
My guess is that it’s an issue pertaining to Sphinx. I suggest you start by making the category->listAction() call directly [using one of the clients or curl] and check /opt/kaltura/log/kaltura_api_v3.log, /opt/kaltura/log/kaltura_prod.log and /opt/kaltura/log/kaltura_apache_errors*log for errors.
Depending on the errors you’ll find, you may want to reindex by running:
# /opt/kaltura/bin/kaltura-sphinx-reindex.sh
I also recommend that you verify Sphinx is actually stopped when invoking:
# /etc/init.d/kaltura-sphinx stop
You may have a zombie proc which would also account for the issue you’re having.