thanks for your kind words re. the LaTeX plugin. Let's see how I can help.
First, you say that you can launch SumatraPDF, right? I assume that means that if you hit ctrl+alt+V, SumatraPDF pops up and shows the file you are working on. Correct?
Second, what happens when you invoke texify (via ctr+alt+t)? Something that tripped me up with Miktex was the automatic package installation. I set it up so that it would install packages for all users, which brings up the UAC dialog. Unfortunately, that typically stays behind the Sublime Text dialog, so you must look for it to appear in the taskbar.
I think this was not a problem when the texify command used to bring up a console, because then the UAC dialog would appear in the foreground. Now the texify command (correctly) runs in the background, but maybe this has the unpleasant side effect of hiding the UAC dialog.
Does this help? Any further info would be greatly appreciated. Thanks! M