Usually, this is also accompanied by:

"I bought something but I it wasn't delivered."

"I click the LULU vendor but nothing happens"

If that's the case, you had probably blocked LULU objects by mistake (it's really easy to press "block" instead of "ok" or "ignore" on the blue menu).

You need to unblock "Lulu Ludovico", then try clicking the Update Swich again.

To unblock:

SL viewer:

People button (bottom toolbar) > Blocked... unblock "Lulu Ludovico"

Firestorm

Firestorm menu > Comm > Block List... unblock "Lulu Ludovico"

Phoenix

Communicate tab (bottom toolbar) > mute... unmute "Lulu Ludovico"

Catznip

People > Gear > banned people and objects... unban "Lulu Ludovico"

http://lu2.me/unblock