Errors on the configuration interface - "Political event" does not show up

I have installed OpenCalais and got it working, more or less. That is to say, I have successfully configured OpenCalais, selected the vocabularies I want to use, and I can call OpenCalais using the tab, and receive suggestions.
However, the first time I did this it picked up a new Calais category called "Political Event" and created a new vocabulary for it. Since I wanted to use "Political Event", I went to the node configuration and checked the category in the "Global" settings. I then got this error:

field is required.
field is required.
field is required.
field is required.
field is required.
Field Start sending on has errors. The year must be a number between 1 and 4000. The month must be a number between 1 and 12. The day must be a number between 1 and 31.
Title pattern for new edition nodes field is required.

Looking at the report logs I find I am getting this message:
Illegal choice in scheduler element
The problem now is that when I ask Calais to process a node, the "Political Event" category still does not show up under the "Calais" tab
Looking at the Calais bulk processing tab, I find to my surprise that there appear to be a lot of "blank" node types. And investigating further in my database, I discover that I do indeed have a fair few nodes which are apparently corrupted, with blank or nonsensical data types (no idea how that happened though).