Any suggestions please???

Doersn't matter, reverted back to 3.6.16 until a solution is found, until then, I will be steering clear of Firefox 4! :-(

Works fine in Firefox 3.6.16, but not in Firefox 4.0, Opera 11.00, or Safari 5.0.1.

I get this error message when I right-click and select Error details.
Unable to download an appropriate decompressor. (Error=80040200)
Cannot play back the video stream: no suitable decompressor could be found. (Error=80040255)

You could try again with a new profile for the Firefox 4 version.

Do a custom install and install the Firefox 4 version in its own program folder, then you can use both Firefox versions.

• Custom installation of Firefox on Windows

Create a new profile exclusively for the Firefox 4 version and create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile to avoid profile corruption.

See these mozillaZine KB articles for information:

• http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
• http://kb.mozillazine.org/Shortcut_to_a_specific_profile
• http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

Some information about using multiple Firefox versions can be found here:

• http://kb.mozillazine.org/Testing_pre-release_versions

Didn't work for me in Firefox 4.0 with a fresh Profile, with no extensions installed - (Java Quick Starter extension is disabled). I get this message box in 4.0 that doesn't appear in Firefox 3.6.16, and neither of the two (just this once) selections allows the web cam to show.

Edit: dom.ipc.plugins.enabled set to false got it working in 4.0!

I wonder if the HTML5 Video Shim from Microsoft will actually fix that??

Does anyone know if version 4.01 has had the above problem solved??? Thanks in advance.