I'm in IT, too and one of the sad sayings (internally) we have when closing a request that we cannot duplicate is "I'm sorry you're sitting in the dark, but the lights are on in my office"
Hope that doesn't sound denigrating, just commiserating! I'm using Safari (a little), Chrome mostly and haven't experienced what you're seeing while here or elsewhere.
Good luck with chasing this to ground and killing it! Would be interested in hearing what the resolution turns out to be.