Opus stops Windows Explorer context menus from working

I'm testing DOPUS and it seems great so far, but I noticed a problem - it seems to damage the shell integration of various programs in WindowsExplorer.

For example, after installing DOPUS none of the WinRAR context menu commands (add to archive, extract here etc.) works in Windows Explorer anymore (clicking them does not have any effect). It's exactly the same for many other apps.
Context menu commands work fine in DOPUS - but I prefer to use explorer sometimes.
All these commands worked fine in WindowsExplorer before installing DOPUS.

When installing, I was prompted whether to set DOPUS as a default handler for this and that - everywhere I selected NO (to keep the current handler).

Is there a way to fix this issue?

I don't know of any way that Opus would affect those menu items in Explorer (I've never seen the problem on my own machines, nor heard of anyone else having it either, for what that's worth).

Are you sure it's Opus? If you uninstall Opus does the problem go away?

Context menus are definately affected by dopus 9.1 - installed the 64bit version and you can no longer select multiple files and "play" - nothing plays. In windows media player, selected songs all play at once.. system restore to before 9.1 and everything returns to normal.

peter_nn0, are you also using 64-bit Vista?

Can anyone else using 64-bit Vista tell us whether they do or don't see the same problem?

I still don't understand how Opus could have an effect on other programs' context menus in Explorer but if there is an issue then it would be good to know which OS to look for it on.

I don't use x64 Vista, it's a plain 32-bit Windows XP sp2 EN-US fully updated.
I reproduced the problem on a similar 'virtual' system (Microsoft's Virtual PC, XP sp2 EN-US 32bit fully updated guest OS, fresh install, on the same host OS).

Uninstalling DOPUS does not fix the problem - it remains.
However, installing DOPUS surely causes the problem, no doubt about that, as I restored a pre-DOPUS image twice(and all was OK afterwards) and then doing nothing but to install DOPUS makes the problem to appear.

Can you please provide step-by-step instructions to reproduce this problem, as it does not happen here at all, and you are the first to report this issue that we know of.

Frankly, there's no way that I know of that Opus could interfere with the Winrar context menu.