Trouble with View PDF (pdflatex)

[Bruce Pourciau]

When I select View PDF (pdflatex) for a document just created (by  
making changes in an older document and doing Save As), I get this  
error message:

File does not exist:
/var/folders/fM/fMVJAuudF3mykCC-YewvpGq6JHA/-Tmp-/lyx_tmpdir.JL1277/ 
lyx_tmpbuf0/O'HalloranJoe(PhDPhysics).pdf

This does not happen with other lyx files. Any help would be  
appreciated.

Bruce