(I merged this with the related thread, but the forum put the posts in a strange order. The previous two posts are from the older thread. This is a reply to the root post at the top.)
Does it matter which type of file you right-click, or which folder you are in? e.g. Try with a .txt file in C:\ to rule out those things.
Is the crash happening when the menu opens, or only when you select something in the menu? From the crash dump it looks like the menu has closed, but it's possible it closed itself or failed to open. On the other hand, if it happens when selecting an item, does it matter which item it is?
The crash dumps indicate the file display is being closed (or changing folders) while the context menu is open, which should not happen normally.
It could be a bug in Opus, maybe triggered by having something custom in the menus; are you using a customized right-click menu or is it just the defaults?
It could also be triggered by a third-party shell extension doing something it shouldn't when Opus asks it to add its items to the right-click menu. A quick way to test that is to turn on Preferences / Miscellaneous / Windows Integration / Hide Windows items on file context menus and see if the problem still happens. If that stops the crash, I can give details on how to track down which component was causing it.
We don't have any similar reports, so whatever is happening is likely to be triggered by either something unique in the Opus configuration or an interaction with something else installed on the same machine.