Auto actions shows a user changed a field when they didn't

I'm experimenting with Autoactions set to show changes in CB Activity.

I have found that for users, if they make a change to one field on their profile and have other fields that I have Autoaction rules for, if they have never changed those fields since creating their profile, when they save, CB Activity shows changes for those as well. I am guessing it should be possible to add an extra condition to check (for NUL in fields perhaps) but can't figure out how?

At present if a user edits their profile I get messages like "removed From" (From in the setup is From [var3_cb_towncity]" so not sure what 'removed' refers to.

In the conditions, if you put several do they act as boolean AND or boolean OR?

(if you think about the example given in the tutorial, for a brand new user, if they change their Mood and nothing else, if I have also have a rule that checks, say, a field called cb_region, if the user has never set anything in this since they joined, when they change their Mood CB Activity will also say they they changed cb_region)

I am guessing it should be possible to add an extra condition to check (for NUL in fields perhaps) but can't figure out how?

Add a conditional to check that the value is not empty.

In the conditions, if you put several do they act as boolean AND or boolean OR?

They're always AND.

At this time you don't need CB Auto Actions for this anymore. The latest CB Activity release has field by field activity logging.