>This is the second time this is happening. It occurred from two locations. When it first happened, I thought it was related to something else. But, when it happened again recently, I recalled some relevent information which could be related.
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>Basically, I have Internet Explorer windows opened. Then, I travel and connect to a WiFi network, such as a hotel network. When doing that, the vertical scrollbar of IE no longer responds. The only way to recover from that is a reboot. I checked instances in memory and there were none. Simply restarting IE did not do it. I really had to restart Windows. Anyone had something like that before and/or some explanations on what is causing this and how to avoid that?

If you connect to a new network, which your computer has not seen before, after a while you get prompted to tell Windows if it's a public, or private (home/work) network. Until you do this, a lot of network and Internet-related apps don't work properly.

I would also expect problems if you had https sites open. It wouldn't surprise me if a change of networks would, by design, cause the trust in such connections to be broken.

But, I'd expect those issues to manifest as complete failures of networking applications, not just as vertical scrollbars not working.