Feedback Problem with feedback

When i try to leave positive feedback, i see info:

prosiaczq, you do not have permission to access this page. This could be due to one of several reasons:

   1. Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?

      Certain forums have specific requirements for posting, which you can find here.

   2. Some areas (for example premium articles) are only available to premium members.

   3. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

Code (markup):

Why is that? Previously there were no such problems

 

May this sound silly, but what is the abbreviation BST?

 

OK, thanks. This must be new rule, because previously i already left two positive feedback.

Again thanks