just as a reference (because I believe this could possibly be slightly related to the Read mark issue), web site coding is typically slanted toward one or two browser types and none are designed to work flawlessly with all browsers.
Because IE and Netscape make up well over 99% of all browsers used (the market saturation, that is) they are, by far and away, the ones primarily targeted by programmers. The software for this board should contain information regarding browser compatability and possibly known issues. If not, contacting the maker or vendor should help. Known issues frequently exist but may not be publicized.
All of the various issues that have come up lately may be limitations on browser compatability and some may be unfixable. As a former programmer there were several browser types routinely ignored completely - webTV being a famous example of worthlessness.