Mouseover bubbles missing

[Sharlow]

Two days ago those amazing little bubbles that pop up when you mouse over an item, spellgem, or any of the icons in your buffbar has vanished. This means I can't do fun things like Inspect somebody, or mouseover to see items in trade, or check buff durations.

I've asked in guild and EC, nobody seems to know how to get them back, or even why they've left. Please help! =+(