This AddOn taints a very large amount of the blizzard ui. This taint even spread to blizzard unit frames during normal dungeon play, making interaction with them impossible in certain situations.
Reproduction:

1. Disable every single AddOn except this one and log taints with /console taintLog 2
2. Click around in the S4 dungeon journal.
3. Find taint.log in World of Warcraft\_retail_\Logs

Taint Log:
taint.log

Of course it is. The addon is changing Blizzard frames, thats bound to taint something. Nothing in your taint log suggests anything got blocked because of it. If you want to be extra careful, just /reload when you're done looking at your loot.