'convert' fails on PDFs

Binary package hint: imagemagick

Hello,

system: gutsy/AMD64
affects: LyX

Starting around June 26, the convert program starting failing to convert PDF images to raster images. I noticed this because this prevents LyX from displaying preview images of PDFs. Several other PDF-related things broke at the same time - I think this is a related to other packages or libraries.

For example, this command, succeeds on my Debian (unstable) box:

% convert c95.tree.pdf c95.png

On Gutsy, I get:

$ convert c95.tree.pdf c95.png
Error: /undefined in obj
Operand stack:
   5 0
Execution stack:
   %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1889 1 3 %oparray_pop 1888 1 3 %oparray_pop 1872 1 3 %oparray_pop 1755 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval--
Dictionary stack:
   --dict:1153/1684(ro)(G)-- --dict:0/20(G)-- --dict:70/200(L)--
Current allocation mode is local
Current file position is 23
GPL Ghostscript SVN PRE-RELEASE 8.60: Unrecoverable error, exit code 1
convert: Postscript delegate failed `c95.tree.pdf'.