[mythtv-users] What is xmltv error 32512, mythfilldatabase runs OK manually however

[ffrr]

My myth system has been running fine for weeks and now suddenly, the 
system log was reporting xmltv error 32512, and no guide info was being 
added.

It also asked was mythfilldatabase running? (where, when?  Doesn't the 
backend run it? I don't know much about how this works))

Mythfilldatabase runs fine manually, and it updates the guide.  

So, where do I start trying to fix this?