Chrome uses its own Flash Player. It's called PepperFlash, and it doesn't play well with NPAPI apps and pages, because it's a PPAPI plug-in.
Go into your Chrome Settings. (chrome://settings in the address bar)
Click "Show advanced settings" and go to Privacy.
Click Content Settings...
Check your Media settings and Unsandboxed plug-in access. Your camera should be allowed, and plug-ins should be too.
If they are and it still gives you trouble, download the Flash Player Plug-in (All other browsers).
Launch Chrome again.
Type chrome://plugins in the address bar.
Click the "+" for Details at the top right, and scroll to Adobe Flash Player.
You'll see two (2) plug-ins listed; PepperFlash and the one you just installed.
Close Chrome and relaunch it. This will force it to "fall back" on the standard plug-in which should work.
Thanks, Maik... but I think is not that !! I changed all you told me and it dosen't work! I try start 2 differents programes; in the first the pop-up doesn't appear and in the secon it appears but the audio doesn't work.
My Internet access is through a Proxy.... it possible than the problem is with the Proxy?
Thanks a lot.