I pushed a group of saved searches to a newly built v4.1.4 indexer from a v4.1.4 deployment head. The .bundle files end up in the /opt/splunk/var/run/[servername] directory on the target indexer and seem to be running fine on their 2-minute schedules. The problem I have is when I go to Manager --> Searches and Reports, and click on the "Run" link located to the far right of the saved searches. When clicking that link, I get the 500 Internal Server Error TypeError: 'NoneType' object is unsubscriptable message. Scoured Splunk.com for any info on what app.conf changes can be made, but came up with nothing.
There should be a 'debugging info' link or something on that 500 page. Or failing that a stack trace which should show up in the web_service log in index=_internal. Can you paste in the info from either of those?