Remember to cover the basics, that is, what you expected to happen and what in fact did happen. If the bug (or problem) is triggered by a particular file, you should try to produce a minimal (the shortest the better) sample file which triggers the problem and include it in your report. Your bug report will NOT be automatically sent to the preview-latex upstream developers. It will be sent to the Debian Bug Tracking System instead, where the Debian preview-latex-style package maintainer will receive it. He will eventually forward your report upstream if he thinks it related to the preview-latex upstream sources rather than specific to the preview-latex-style package for Debian. If you think that your bug report is not specifically related to the Debian package and would like to send it directly to the preview-latex upstream developers, abort this bug reporting procedure now and follow the usual bug reporting upstream conventions of preview-latex (look in the preview-latex-style documentation directory "/usr/share/doc/preview-latex-style/").