ok, it happened to me!
i know there's been a few discussions lately about it, (tried to find them, but couldn't? Shane was involved in one..)
anyway
it was a very real shift to the right and then back again, right at the start of the fade out
lasting aprox 2 frames.
the effect had been rendered
DV PAL sequence,
3 layers of basic text, all with an identical fade out,
no bg image
it was NOT a monitoring issue.
i removed the transition, and re-applied, and re-rendered,
this time it was clean.
weird,
but happily, solved quite painlessly.
(not too unlike the classic "turn it off and on again"!)
so i'm just passing it on.
cheers,
nick