From PhilPapers forum Bug reports:

2010-01-29
Disappearing text
I denote intentional objects by placing them between less than and greater then signs as the mention of words is denoted by quotation marks. Reading my posted text, I found out that the text so marked does not appear. Perhaps this has something to so with the use of these signs to denote HTML commands. While my notation is my own, the same signs are used in inequalities, for example in discussing probabilistic arguments, and in quantum theory to denote bra and ket vectors. Thus, the inability to display this kind of text can cause problems in many discussions.

DFP