I see somebody has beaten me to this. I originally thought there had been a problem with the video clips at: Console vidéo de la LNH - Canadiens de Montréal
I do occasionally encounter transient problems on this site where certain pages will refuse to load for a few days & then they get it straightened out. Then I noticed I wasn't seeing Flash videos at another site. So I completely uninstalled Flash, including the version for IE, which I almost never use, preferring Firefox. Then I reinstalled Flash for FFox. No go. Tried it a couple of times, in case I was seeing a transient problem. Still no go. So I went into IE 64-bit & installed Flash from there. Presto. No problem. So I came to the Forums here & stumbled across a mention in some thread I probably couldn't find again of an Adobe Flash uninstaller program. There was a link to it in that thread but I think you can just search Adobe's site to find it. Oh. Wait. I just looked at page 1 of this thread & I see Brink has a link to it up at the top. Typical. Should have known he'd be that thorough. So. Back to my saga. Uninstalled Flash with their uninstaller (instead of just from Control Panel as I had been doing, which I can't tell there's any difference) & reinstalled again a few times, with no success. Then I hunted around at Adobe & found one page of advice about using the Flash Settings Manager to delete all their files. Another step there said to delete a certain structure of Flash-related directories under %APPDATA%. I deleted the files using their settings thing, uninstalled, then cleared out the directory structure they talked about. I'm not going to post what that was because I believe it was a wasted step. The particular structure was empty when I looked at it, no doubt because I had both deleted the files from their Settings thing and then uninstalled Flash.
So after yet another install & still seeing nothing, I hunted more vigorously at Adobe & came across the link Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?
that Borg posted a few days ago. I find it annoying that (a) Adobe didn't have anything in their automatic update process to warn people about this new Protected Mode, & (b) they put the advice about disabling Protected Mode at the very bottom of their list of evasive actions to take, behind a load of useless steps like disabling all your other plug-ins one at a time, running FFox in protected mode, and disabling the conflicting Real Player thing which the Mozilla folks pushed out as an automatic FFox update a few days ago. Those steps will do nothing but annoy & upset you when their alleged "last resort" step is the one that cures the problem.
One thing they don't say in their instructions is that you have to edit their configuration file via an elevated Notepad (Run as Administrator). They talk about placing the file in an updatable place & then copying it. How gauche.
Something I find a bit odd about this is Adobe's automatic detection of your system & automatic selection of the Flash to download. Their site did correctly say I was running a 64-bit version of Windows but as far as I can tell, they gave me a 32-bit version of Flash. It works, so I'm not complaining. But I did notice something on their web site that bragged how their Flash was 64-bit. Maybe only in IE. I don't know.
Anyway, I just wanted to confirm that the instructions on the Adobe site for disabling Protected Mode do solve the problem & I would thank Borg except I found his post after I had essentially duplicated his work before I knew he had done that work. I guess that'll learn me!