Full Idea
There is little agreement among Fregeans about what senses are.
Clarification
'Sense' [Sinn] is the strand of meaning apart from the reference
Gist of Idea
Fregeans can't agree on what 'senses' are
Source
Cappelen,H/Dever,Josh (The Inessential Indexical [2013], 04.5)
Book Reference
Cappelen,H/Dever,J: 'The Inessential Indexical' [OUP 2013], p.71
A Reaction
I don't take this to be sufficient grounds for dismissing Fregean senses. When we look into the workings of the linguistic mind, there seems little prospect of clarity or agreement.