So yeah, didn't expect to be back so soon.

I was doing the leve Necrologos: In Shadow Bemantled when suddenly, my status icons weren't wearing off. After the leve, I could still hear the battle music even though I was out of battle. But I was also suffering some of the negative effects of statuses that should have worn off, such as Stun not letting me move/act, and reduced maximum HP from weakness. Good stuff, that stun lock. Makes Shock Spikes even nastier.

You'll be wanting all of this for your ticket.

ISP: Time Warner Cable
Type of Internet Connection: Cable
Internet Connection Speed: ~8mb down, ~1mb up
Date & Time: 12/23/2011, 5:24 Eastern
Frequency: First time it's happened
Character Name: Spiriel Sylph
Race: Miqo'te
World: Besaid
Class/Skill Rank: GLA 37
Area and Coordinates: Central Shroud, 30, 32
Party or Solo: Solo
NPC Name: None
Monster Name: Vile Gnat
In-Game Time: Probably around 10-11 PM, 5/9?
Steps:
1. Receive status effect
2. Let status effect reach 0:00
3. Status effect doesn't disappear from GUI, some effects remained behind.

This also occurred with some buffs leaving their icon behind, although I didn't get the positive effects from those, as far as I could tell.
Invigorate - No lasting effect that I could tell.
Weakness - Max HP reduced from 1485 to 1113
Stun - Can't move, can't act.
Rampart - Unsure
Shock - I don't remember if I continued to lose HP

Effects that are removed through methods other than timing out removed themselves just fine under thos conditions, such as Sleep, Bloodbath, Aegis Boon, etc.