I rebuilt this project twice from scratch, and I cannot understand why my VSIX menu items and parameter pages load in debug mode, but not by manually installing the .VSIX file. Nothing appears in the Output window, and I'm not sure where to look for VS-logging of this kind of material.
IT WAS WORKING earlier, but stopped about a week ago.
I even created a Hyper-V W8.1 virtual machine and installed VS2015 (final release) and installed VSIX, and it just doesn't load at startup if I don't debug it.
This is the final result of VS2015.
My source code is at https://github.com/cbordeman/Mvvm-Tools .
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