Web Personalization/RTP - Web Segment Advanced Filter not Available
Issue
Advanced Filter for creating web segments is not selectable as an option. Only ALL or ANY filter logic can be selected. Why?
Solution
In order to select the advanced filter logic for creating a segment, there must be at least three filters in the segment. Otherwise, the option will be 'grayed out' or not selectable. This is similar to smart lists where:
"Advanced filter logic is only available if there are three or more filters in your smart list."
https://docs.marketo.com/display/public/DOCS/Using+Advanced+Smart+List+Rule+Logic