Hmm -- what data subs do you have? I have TSX level 1 and have never gotten charts to work for TSX stocks. It always says No market data permissions for BEST STK, which seems erroneous but nevertheless that's what it says.
I'll have to test that when the TSX opens. But using SMART yesterday after the close, I got a permission error. Using TSE gives me something. If I do 1 day, it says Trading .... has ended at 07/25/07 16:00.... so I suspect it will work. If it doesn't work, I will post a follow up. (Sorry, I like to say TSX as that's how Toronto refers to itself but TWS uses TSE, so I keep mixing the 2 when talking in the context of TWS!)