[Stream Recorder]

Try to disable your firewall, antivirus, antispyware temporarily and see whether it helps.

[skido]

Well, I have tried that as well. I disabled my Norton firewall but it did not affect to the problem.

Then anti-spam programs (Windows Defender, Ad-Aware) are only active while scanning is in progress.

What comes to my Anti-Virus sw it has no setting it can be disabled temporarily and I have thought about that as one problem source. But I have gone through all configuration data of anti-virus sw and haven't found anything suspicious which might affect. In addition, anti-virus sw usually informs clearly if it decides to take some action.

[skido]

I have to correct my previous post that there are some components which are active in Windows Defender also in those times the scanning is not running. But nevertheless, I have gone those settings through and haven't found any log info that Defender had blocked NMS streaming.