You are right, it's not related to Reflector at all.
Beside the send report button, I didn't go further.
Just spent the last two days re-installing and re-configuring my PC.
There was something just not right with VS, hanging issues etc ...
Not much without trouble, I had to re-install twice as on the
first install everything was right except Resharper hanging the whole thing.
I gave it another try, this time I did it minimalistic, no full install everytime;
everything works and it's even a little faster.
So no really answer about the origin of this issue,
but I wouldn't be the first time I see such 'strange behavior' on a system.
Anyway, thank you