We don't have widespread reports of any crashes like that. These are the only ones I can think of recently, other than the Atheros Bluetooth crashes which no longer happen in 10.0.2.1 after we blacklisted their DLL.
So the problems you're both are almost certainly caused (or at least triggered) by 3rd party software that is integrating with Opus on your systems. It's usually shell extensions or video codecs, and programs install those without you realising. (If you look with ShellExView (mentioned in the FAQs below) you'll find hundreds of shell extensions on a typical system, and bugs in them can cause crashes. Most of them are fine and useful, but it only takes one bad one to make things unstable.) It's also possible there's a bug in Opus, triggered by something unusual about a file in one of your directories, but that is rare; either way, the steps to narrow down which file is causing the problem are largely similar.
Go to the FAQ list and scroll down to the Other Troubleshooting section and look at these guides:
[ul][li]Crash, exit or high CPU usage when viewing certain directories (since you mentioned it crashes when navigating local folders)
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[li]Crash, exit or high CPU usage when right-clicking certain files (if applicable)
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[li]Crash dumps for bug reports (if you have some of them it may let us detect which DLL the crash is happening it, which is often a bit hint as to where the problem is)
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[li]General slowdown or instability investigation steps[/li][/ul]