[chris_wot]

What you have to say about it probably won't be positive if you use Internet Explorer and it doesn't work. No loss to Paydirt! In fact, a gain - they don't have to spend any development or support time explaining why they don't support the Internet Explorer specific bug you encountered.

[brudgers]

IMO, when it comes to accounting software, the browser shouldn't make a damn bit of difference to how it works, only to how it appears.

If a choice of browsers breaks a modern accounting application, that's poor design, not a feature because an accounting app damn sure better not be relying on javascript's math capability.