Well, it is already established, that your computer(s) are quite abnormal, since the forum error with the email template is not happening to you, but to everyone else beside you it is (or it was - no error while these two posts had been made) happening.
Nonsense. You are mixing several separate issues.
1) YTD problem: My computer may well be abnormal, but it is a fact that YTD used to work fine for everyone and then,
without any changes to the program because I didn't have time to work at it, suddenly stopped being able to connect to the net for many users. Which indicates that the problem lies outside YTD. The possible causes are numerous, but I consider the most likely one to be some Windows update. Another possibility is that YouTube.com started detecting YTD (e.g. by testing the User-agent string) and blocking it, but that is far less likely as it would stop
everyone from being able to use YTD.
2) The e-mail template problem was related to the forum language users specified. It has been identified and fixed some time ago and reported as such in the relevant thread.
1) your explaination (there is a hidden bad program, that prevent YTD from network accessing) fail miserably to explain why in the end, the download IS started - so unless you come with better explaination that cover this "little" hole in your teory, then this teory is dismissed.
Whatever. Until I get a better theory, I will stick to this one.
2) great that you try different computers, so do I and there you have video from the failure(s) in progress:
And how does that help me in identifying the source of error? If you bothered to try the approach I suggested, you would be able to say that, e.g., "I get the error even with
clean Windows XP SP3 Czech". I would then compare your link against my installation of the same version of Windows and notice that it works for me, which would suggest that perhaps it is not a problem related to Windows, but to the network. Or I would confirm the problem and would finally have a machine where I could experiment. But no, you know best - the way to find the problem is to post message after message until magically I decide to remove the bug.
and it is happening on WinXP SP3 machine, as well, as on WinXP SP1a machine...
This is a useful information. Not completely, because
my clean install of Windows XP SP3 works just fine and I don't know what was installed into yours, so there is still a possibility of influence of some of your installed application, but much better than your previous reports.
As you can see, in both cases the video started the download, so there is *NOTHING* that block YTD requests or net access.
No, I don't see that. There is nothing in your video to indicate that the YTD's access to the net is unrestricted.
The Win7 SP1 is my GF machine and it is completely clean (besides few games, Firefox... and that mostly it is).
I find the "completely clean besides games, Firefox, etc." amusing. Clean means "in the state it was just after installation". Anything else is not conclusive.
No firewall or antivir on all tested computers.
Cleanly installed Windows contain an active firewall. Once again, you are misrepresenting the real situation - either you disabled the default firewall, in which case your system is not clean, or you didn't even consider it, in which case you can hardly claim that there is no active firewall on the computer.
http://youtu.be/_zHZSo4vC0I
The error message clearly says that this video uses an unsupported obfuscation scheme.