[OS X TeX] Three typeset versions in Leopard?

[Shawn Allgeier]

I installed Leopard on a new computer and then installed the TexLive  
2007 distribution.  Tonight I observe some peculiar behavior when  
typesetting.

Typeset #1 = Expected output in TeXShop preview window.
Typeset #2 = Font has changed to something generic and math renders  
mostly (large parenthesis show up as ascii characters stacked in  
columns to form the brackets)
Typeset #3 = Math renders properly but fonts are still generic.


Typesetting a 4th time returns back to proper output and the cycle  
continues.  I am not changing the tex file between type settings  
(simply pressing apple-t repeatedly).  It is not too alarming since I  
can just keep type setting until I get the proper output, however this  
is new behavior as of tonight.

Have I accidently changed a preference or is this a Leopard glitch?   
My other computer is running Tiger and TexLive 2007 as well.

Thank you,
-Shawn Allgeier