Miscellaneous: Invisible Characters when they shouldn't be.

[Iancain123]

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.