Hi, ACT,
There's no simple answer. We can do totally IE/FF/Opera/Safari-compatible CourseLab runtime, but in this case we will need to cut off ALL the features, that currently works in IE only. Is it fair?

We are not IE fans, however (in fact, I write this post in FF

). But when it comes to e-learning (i.e. when we need really feature-rich content) - IE still has a lot of useful features, that are not available in other browsers. That's why we did CL IE-based.