I was previously using a custom theme and Websimon was displaying perfectly, have since changed to TwentyTwelve and some of the horizontal lines seem to be double-thickness for some reason. Does not happen on IE or Chrome but does on FF.
There is nothing oddball in the table editor like HTML codes in the text in the entries etc.
- just loaded a few instances of FF and the double-thickness line actually moved around to different parts of the table.
Any ideas? Thanks.