Issue with SP4

[dwmkerr]

I installed Switch for MSVS2012. The first time I start MSVS2012, I map the shortcut to CTRL+SHIFT+Q (and I can see a button on the bar, too, on the top). Everything works as advertised, I can flip forth and back – perfect.
I close MSVS2012 and wait a bit, then start it again. The icon from the top is gone, and so is the keyboard shortcut.
I am using MSVS2012, SP4. I wonder if there’s a compatibility problem with SP4…
Any chance to have a look?
Thanks a lot, this extension is a life-saver!