LyX-13x: Copying Graphics Files to tmp dir

[Bennett Helm]

I'm not sure when this happened, but recently LyX's attempts to copy 
graphics files from their original directories to the tmp directory 
results in files of 0K. This is with LyX 1.3.x (current CVS) on Mac OS 
X.

LyX 1.4.0 does not have this problem.
Any clues what may be going wrong?
Bennett