I had the same cannot import name SIGNATURE_HMAC error as papachan
causing sso-login and thus also software-center on launch.
I resolved it by reinstalling the oauthlib package via pip.
sudo pip install --upgrade oauthlib
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I had this same problem on my gentoo machine
I don't have it anymore if I start Konsole with Konsole --notransparency
nvidia 270.41.06
xorg 1.10.1.901
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