So there are entries in the right-click menu?
Please paste the following into your console
Then try typing ctrl+alt+c. You should see the following in your console.
If you don't, your keyboard settings must be messed up.
You can also explicitly run the commit command by pasting the following into your console. You will need to have a file open from your Hg repository for this to work.
I'm not sure where to go debugging from there. I am running the same OS, same version of Sublime and the same version of TortoiseHg as you, and everything works perfectly fine.