I have a strange problem with tortoise git at the moment, which I can't figure out. When trying to commit to my repository on github I get the error

ERROR: Permission to martindevans/Hermes.git denied to key2

Key2 is a key I use to access a different github repository, however the remote url is not set to use key2, as you can see here it's set to use private.ppk

enter image description here

Am I doing something obviously wrong, or is tortoise git broken?

Nb. In response to the comments. Using normal git results in:

C:\Users\Martin\Documents\Visual Studio 2010\Projects\Hermes>git push
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
git tortoisegit
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