Preview-Thumbnails in YouTube’s progress bar Disappeared!

Callender said:

Which player is detected here: https://www.youtube.com/html5

all types are checked!

Callender said:

Also review this post regarding a clean install of flash player:

Flash Player 11 not working

I have already done clean installs of Flashplayer, as I have already mentioned above! (even previous versions of them, v.21, v.20, v.19) that there was no problem at all, with them; ie. before the latest update of the Flashplayer v.22.

The problem remains.

PS. Let me say that I'm using a previous version of Firefox, v.30, since a year now, and having no problems, what-so-ever, so far. And I'm not intending to update to later/latest versions of it; because of a very inportant plugin, the "CoolPrevious" that, after v29, stopped supporting the new versions of Mozilla. I'm using "CoolPrevious "all the time, I've got used to it, and can not do without!!! So, I will definately stick to this version, because there has been no alternative to CoolPrevious so far.
It would have made sense that, with a previous version (v21/v20) of Flashplayer, all should work fine, as they used to do, with FF v30.0 - for more than a year.
But now, this came up...
There must be some workaround, that a tech-genius would think off...
I hope :) :)

Yupeeeee!!!!!! thank you! thank you! thank you!
It worked like a charm! Now, "preview-thumb" in progress-bar shows OK!!!

( When I wrote, above, that : "all types are checked ", I was trying the latest version of FF v.47.0.1 and then, of course, the highlighted box showed as above. BUT, when I installed back the preffered version of FF v.30.0 ... it was telling to "ASK for the HTML5 programm", ... I clicked on it, ... refreshed the browser and now ALL is WORKiNG OK. )

It was a headache...
Thanks again.