Right click and open with issue

Hi,

I have Start8 and ModernMix installed and everything has been working great.

There is however a niggling issue that occasionally causes me grief.

When I right click on anything and try to select 'open with' so that I can change the default program nothing happens.

It looks a little like it flashes very very briefly and then disappears behind the desktop almost.

I can't find the box if I go back to metro or whatever that splash start screen is.

Any help or suggestions would be most appreciated.

Cheers, Chopper