If a 'Taxonomy: Terms for' field is added to a Views Calc view that is a free tagging multiple term vocabulary, the Count is incorrect.
For example, if a submit a node with 2 terms from the same vocabulary called 'apple' and 'banana', the node is counted as 2 instead of 1. With only 'apple' assigned, the count is correctly 1.
Further more, if a node type has more than 1 vocabulary and has terms from each assigned, the count goes haywire.
For example, I've got 6 nodes that are counted as 15. 3 of these nodes have 1 term each from 2 vocabularies while the other 3 are not tagged at all.
I realize I haven't provided much support, but has anyone else been successful when adding 'Taxonomy: Terms for' fields? My current workaround is using the 'Taxonomy Field' fields, but this only works for me because I am using Content Taxonomy. I also did this on a new local install without Content Taxonomy (to make sure no conflicts were happening) and the issue still occurs.