Expressions don't seem to work the same way in MC13 as they did in MC12.
For example, in MC 12 I used an expression to fill the Keywords field with information from other fields ansd wrote up a description that is now in the MC Wiki
http://wiki.jrmediacenter.com/index.php/Photo_Tagging#Use_of_XMP_Tags:
=if(IsEmpty([Genre]),,Genre\[Genre];)if(IsEmpty([Event]),,Event\[Event];)if(IsEmpty([Location]),,Location\[Location];)if(IsEmpty([Places]),,Places\[Places];)if(IsEmpty([People]),,People\replace([People],;,;People\))
In MC 12, the expression elegantly filled in the Keywords field with different entries delimited with semicolons. MC13, the Keywords field does not parse the expression as an expression at all (it does not evaluate it). Rather, it fills the Keywords field with the text of the expression itself.
Is this by design? If so what is the appropriate way to accomplish what I did in MC12. If it is not by designm, please fix.