If you keep getting "HELLO, YOU EITHER HAVE JAVASCRIPT TURNED OFF OR AN
OLD VERSION OF ADOBE'S FLASH PLAYER....GET THE LATEST FLASH PLAYER":
don't bother downloading and re-installing the latest Flash over and over and over again.
You will get absolutely nowhere doing that, because that is only adding to the problem.
Your YouTube was working fine just a little while ago, right?
There can really be only 3 possibilities:
1) something is wrong with YouTube
2) something is wrong with your cache
3) something is wrong with Flash 10
1) YOUTUBE:
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Your problem may fix itself within a couple hours, or by the
next day, because YouTube often "shuts down" a bunch of
their own servers every single day without warning anybody
in order to update all kinds of stuff. During those occasions,
it's YouTube's transmissions of "JavaScript" or "Flash" that
are poor -- not your reception of it. This sometimes creates
"time-out" or "run-time" errors giving that message. Hit "F5"
or click "Refresh". You can also click "Back" and "Forward".
2) CACHE:
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If the next day your YouTube is still showing you that awful
"JS or FP" message, maybe your directories of "temporary
internet files" and "cache" memory are full and cannot take
anymore. As such, videos can't even buffer, let alone make
it onto your screen.
"Temporary internet files" are 1000s of tiny bits of websites
permanently put on your computer's hard-drive. They'll stay
there forever and ever, gradually plugging up your computer
(like hair slowly clogs a sink drain) until you get rid of them.
Otherwise, one day your YouTube will suddenly be STUCK.
Because your computer now has such little space in which
to "cache" a video, YouTube will mistakenly think that your
Java Script "run-time environment" or "buffer overflow" is off,
or that your player is older than "FLASH 7".
The solution to all that is to exit YouTube (but not your web
browser), then clear your "cache" of all its "TIFs", "cookies"
and "history". (See below.) After that, shutdown and reboot.
3) FLASH:
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Watching YouTube vids hasn't changed in the past 2 years.
(If you want, you could still use Flash 8.) The newest Flash
players are causing grief for many YouTubers -- particularly
all 8 variations of version 10.
It's absolutely nuts that there's 10.0.525, 10.1.218, 10.2.26,
10.2.54, 10.12.10, 10.12.36, 10.15.3 and 10.22.87. Usually
most updates are good for only 1 thing:...Software conflicts.
I've never strayed away from 9.47, and many "flashers" use
9.45 still. Think of them as Windows XP compared to Vista.
Look at what the Asker said after this Best Answer of mine:
https://answersrip.com/question/index?qid=20081125075929AABZpVS
If that seems interesting to you, here is the appropriate link:
http://www.oldapps.com/flash_player.php?old_flash_player=14
Note 1: if you've got an "Accelerator", dump it, burn it, rip it,
kick it, trash it, disable it, uninstall it; do all that you can to
get as far away from it as possible. Several "Ad Block" and
"Messenger" programs also conflict with YouTube.
Note 2: some longer videos may need "Shockwave" to play
properly.
Note 3: a very odd fix that once worked for me was altering
the URL from "www.youtube.com" to simply "youtube.com".
Note 4: if you downloaded Flash, did you actually INSTALL
it afterwards? If you got Firefox, did you enable the add-on?
I hope that my info and long answer are quite helpful to you.
Internet Explorer 6:
→ Tools → Internet Options
→ Delete Cookies → OK
→ Delete Files → OK
→ Clear History → Yes
→ OK
Internet Explorer 7:
→ Tools → Internet Options → Delete...
→ Delete files → Yes
→ Delete cookies → OK
→ Delete history → OK
→ Close (browsing history window)
→ OK
Internet Explorer 8:
→ Tools → Delete Browsing History
[. ] Preserve Favorites (leave blank)
[x] Temporary Internet files
[x] Cookies
[x] History
→ Delete
Mozilla Firefox 3:
→ Tools → Clear Private Data
[x] Browsing History
[x] Download History
[x] Saved Form and Search History
[x] Cache
[x] Cookies
→ Clear Private Data Now
Apple Safari 3:
→ Edit → Preferences
→ Security (tab) → Show Cookies
→ Remove All → Done
after that:
→ Safari → Empty Cache → Empty
after that:
→ History → Clear History
Google Chrome:
→ Tools (wrench) → Clear browsing data...
[x] Clear browsing history
[x] Clear download history
[x] Empty the cache
[x] Delete cookies
Clear data from this period: → Everything
→ Clear Browsing Data