Tab completion

I'm running the latest darcs snap-shot and I've noticed that tab
completion no longer works from any of the input modes ( F12, Mod1+F3 or
F9) Oddly enough shift+tab will cycle backwards through the choices but
tab alone does not work. Here is the error from x server:

ion3: No encoding given in LC_CTYPE.
ion3: Argument 2 to complete is of invalid type. (Argument template is
'oSS', got lua type boolean).
ion3: Stack trace:
0 [C]: in 'complete'
1 [string "WEdln.complete(_, true)"]:1
  [Skipping unnamed C functions.]