Here is some more information. There seems to be a problem when adding timers.
I updated MediaPortal to the latest version, 1.15.0, to try and fix the problem. However, that wasn't the solution.
It looks like the settings for creating Timers within Kodi have changed since 14.1. There are several problems that have occurred since I updated to Kodi 16.1. Repeating timers don't seem to flag entries in the Program Guide as "Scheduled", so the EPG UI doesn't show a check by these entries, and other UI indicators don't show up.
For example: Using the Kodi UI, If I add a timer to record every showing of "Stargate SG-1" on a particular channel, it doesn't update the EPG that these shows will record, so its not obvious that the timer was created. I created a repeating time for a show in progress, and the recording started, so it seems to do the actual recording.
When I created a Non-Repeating time for a single episode, the EPG was updated with a check mark, and the "Next Scheduled Recording" indicator on the Kodi UI showed up as expected.
A Bigger problem is when adding a Timer to record a show regardless of channel. This seems to foul up the whole scheduling database. For example, I wanted to make a timer to record "Star Trek" no matter what channel it was on. After that, I was unable to access the "Schedules" section of Media Portal TV Server Configuration tool.
I found this post that had a similar problem,
http://forum.team-mediaportal.com/thread...nk.121987/
and using that as a basis I erased and reloaded my SQL database and that solved the problem.
I don't know enough to troubleshoot further though.