I did a search about this and I couldn’t find anything related to it so I decided it might be a good idea to post it here.
First of all, I’m not complaining about bots – I understand that you, Anet, are fully aware of the problem. However I would like to bring it to your attention that I have been encountering a few botters that have found a way for their characters to be untargetable, therefor I cannot report them.
Again, not raging or anything just wanted to let you know about it.