changing the quote

Hi the list,

I am using R2.6.2. I don't now why, the quote used in the output of 
'new' seams not compatible with Sweave. Is there a way to change them ?
Is it something link with R, or link with my computer configuration ?

 > setClass("E",list(e="factor"))
[1] "E"
 > new("E")
An object of class ?E?

Thanks

Christophe