Yes I have experienced this in a 737-800.
Selected flaps which didn't run.
Ran the trailing edge dissagree checlist(now deleted)
and attepted to extend the flaps with the alt flap
extension (electrric).
At this stage we go asymetric flap.(Great)
Ran the checklist for this and
this leads you to the trailing edge flap up landing check list.
Following investigation found that this had occured some
3-4 times in our fleet.
Bad batch of flap position sensors in the wheel well,
The supplier apprently used the wrong grease!
This took 40 minutes to compleat all checklists
and configure for landing. We burnt 2000kg of
fuel, Lukily I arrive with 4000kg overhead.
Not much fun after a 2 second sector, after a red eye!