Invisible Characters when they shouldn't be.
 

I've experienced this several times over the last 7-10 days. I'll be in ec tunnel ready to do a trade, port someone, etc. And I will either be invisible to them or they will be invisible to me (no spells). Cannot open a trade window with them or anything (when the invis person tries to trade with non invis). Camping out and logging back in fixes the issue every time but it's strange this has become a fairly common occurrence recently.

this was a common issue a lot harder to reproduce that when both characters logged in/zoned in at the same time, there was a mini window that would make your client not see that person, even tho if it joined group throught other people you would see him in a diff zone. And as you mentioned it would be invis to you, but if you casted grp buffs would also land but now show until relog, ports would still port you too. With faster load zones that does happen more often, not sure if thats something that can be fixable.