> So I moved them to a subdirectory in the temp dir and the app ran
> fine ( just creating two new ib_sorts - lucky I cleared up some HD
> space ).

Just delete them, if IB lets you delete them and they are IB sort files,
they are no longer in use (I beleive that IB keeps the sort files open).

IB should clear them up, there have been odd problems with them being left
about, but the most common from my point of view is if the server crashes.

Anything in the log around these times.
JAC