Why are some symbols rendered incorrectly on some systems?
You’re most likely using the GhostScript rendering backend if you encounter this. First of all, try to use Xpdf-based rendering, as this solves a lot of problems. If you’re stuck with GhostScript for some reason, note that some versions prior to 8.15 seem to have some serious rendering bugs (like drawing hyphens at the wrong location in some pdfTeX genereted files) or even crashes. To solve this, you should upgrade to a newer GhostScript version. If you can’t or don’t want to do that, you can also try to find a machine with a decent Xpdf or GhostScript installation an render the PDF into images there using Impressive’s -o option. The Windows version of Impressive already ships with Xpdf 3.02, so you will likely not get any of these problems there.
