Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi,
I just downloaded DocUI 2.1 and configured it according to the given PDF.
All looks great, but there is an issue which bugs me and i cannot ignore.
It seems that when i am near many people, i often get the sound effect of target switch constantly.
This doesn't happen when i don't use this UI.
Can anyone give any input on the issue?

Thanks!

I found the source of the problem.
It's the addon called "CustomNameplates".
I noticed that when i am currently targetting something the sound would stop, and reapply when i have no target.
I decided to read CustomNameplates.lua to find out why it's doing that and it seems that it makes calls to TargetByName(name, true); inside "fillPlayerDB", after that the script makes calls to ClearTarget(); so you don't notice target change.
I guess that it does this to gain information about the players around you so it can draw cool nameplates.
IMO it's too annoying and i do play with sound on.

Sorry for necro'ing this thread, but I have encountered the same problem and have not been able to find a solution either, even though I understand the nature of the problem.

Hopefully someone with more knowledge can provide some insight.