After updating to Precise had a few times the following mishap: when I try to convert to pdf many (100, 200) jpegs or pngs, my system gets completely stuck and need hard reboot. Or, more fortunately, I get an unreadable pdf.
With a few images all seems ok.
Is there a limit to the number of files converted in Imagemagick with one command like
convert *.jpg new.pdf
or is it something else the matter?