I've had the problem since I upgraded to v7 that if the background color of the WYSIWYG editor is not the same as the posts table background (which it can't always be the same since even and odd posts are different colors and there's only one color for the WYSIWYG editor ) the text on the post will be highlighted with the background of the WYSIWYG editor....... example here
I posted a couple times about it and was told that the bug was in the WYSIWYG and not on the forum and that the only solution was changing the background of the WYSIWYG editor, i using different color but it would always happen sometimes cuz even and odd posts have different backgrounds........
Well now looking at the code i figured there's a pretty simple way of fixing this problem by just adding the following on functions_format_post.asp around line 68:
Dim lngStartPos
Dim strTempMessage
Do While InStr(1, strMessage, "style=""BACKGROUND-COLOR:""", 1) > 0
'Find the start position in the message of the style="BACKGROUND-COLOR: #123456" code
lngStartPos = InStr(1, strMessage, "style=""BACKGROUND-COLOR:""", 1)
'Read in the code to be converted into a hyperlink from the message
strTempMessage = Trim(Mid(strMessage, lngLinkStartPos, ((lngStartPos + 33) - lngStartPos)))
strMessage = Replace(strMessage, strTempMessage, "", 1, -1, 1)
Loop
that way when the post is formatted it'll check if the background of the post editor has been exported to the post and if it has it'll remove it! It would be nice if this problem could be addressed on the next release 
Edited by fernan82