I probably know what's the reason:
I guess Tersus is using innerHTML to provide my own HTML Tags to the website.
Unfortunatelly our beloved IE doesn't allow to create <DIV> (and i guess other elements) in <TABLE> element using innerHTML. It can be only done by using appendChild.
As the default Tersus structure is made using <TABLE>...so only Firefox (and probably other browsers) can render it.
You could do further research but I think that's the problem. To solve the problem you would have to change method of putting data to the website from innerHTML to appendChild (which is more problematic and slower).
Here you can read about this thing:
For best results, use the Firefox browser..