YouTube has put many restrictions over the past 2 years as far as the number of Messages, Share Video and Comments you can send in a given day. So it is more important than ever to make those sends count.
We have added a new feature which will allow you to filter users by the last time they logged in - to make sure this is a current user, or by the number of uploaded videos - to make sure you don't auto-subscribe to a channel with 0 videos, or by the number of Friends - so you can connect with 'popular' users. This feature has been added to Messenging, Share a Video, Subscribe to Channels and Send Comments to Users.
We have also added multi-account sending to the Share a Video feature just like you can with messages. The only restriction with multi-account sending is that you can send from 4 additional accounts for each Professional Account that you pay for. So, if you wanted to send messages from 20 accounts, you would have to pay for 4 Pro accounts.
On a side note, Tube Toolbox keeps getting more and more complex which means it is more and more likely to have little bugs and it's harder to fix. So thanks for your patience.