Try to enable safe download mode option in the Preferences->Network. It will reduce amount of connections to YouTube and prevent its ban.
Firstly, check your "Preferences". Switch to "Download" page and check "Simultaneous downloads" option. Default value is 5. You can decrease it to minimize CPU usage.
Also, we recommend you to remove completed downloads. Large list can cause this problem. To do it select "minus" icon at the left bottom corner of program's window. And select "Remove completed".
Check output folder specified in Preferences. To do it open Preferences and switch to Audio output tab. Specify output folder with write access.
If you are using Ubuntu we recommend you to type the following command in Terminal:
sudo apt-get install ffmpeg libmp3lame0 libavcodec-extra-53
If you are using Window or Mac OS then uninstall current version, download installation from our site and install it.
Check connection to YouTube.com in program's Preferences.
Open Preferences and switch to Network tab.
There is indicator which displays connection to YouTube server. It is located at the bottom.
If it is red then specify correct settings (like proxy). Also, you can check your firewall settings.
The content in the clipboard you are trying to paste is incorrect. Maybe you've copied some extra characters and the video link became broken. Try to drag'n'drop the link on program's window.
This mean that all streams in this video are DRM-protected and unable to be downloaded. You can read more about RTMP protocol and protected streams at Wikipedia.
Probably you have set your output folder to folder located on external drive/usb stick with NTFS file system. Mac OS X include only read-only support for NTFS-formatted partitions. You can read more about NTFS at Wikipedia
You can disable multiple connections. To do it open program's preferences. Then switch to "Network" tab. And set "Maximum connections per video" to 1.
By default all files are saved to Downloaded by MediaHuman subfolder of your Music folder. You can also right-click on downloaded track and select Locate saved file
Open Preferences, it located under small gear icon on the bottom left side of app's window. Next open Audio output tab and select desired iTunes options.
This is a normal situation when Boost mode is enabled. It means that the app downloads only audio track skipping the video part. Output audio quality is the same but is saves a lot of traffic and time.
If you are using security software from Webroot, when you need to allow our app to access clipboard. To do so open SecureAnywhere -> Identity Protection -> Application protection and click on Allow near youtubetomp3.exe. You can read more in their FAQ.
Your playlist is private, so make it public before download or setup YouTube Authorization in the program's Preferences
This is one of those hard to replicate bug, but the majority of our users who are affected by this issue reported that iTunes reinstall fixes this bug.