Tax Breakup Error

Hi,

I've been using Google Apps for ages now but wanted something that could generate online invoices, CRM and various other tools that Google don't provide. So WOW is what I said when I discovered Zoho today.

I'm in the UK and have added VAT @ 17.5% but when I add items to my test invoice I get a couple of pop up errors. The first says Taxbreakup.9528000000004028 is null followed by javascript error: Taxbreakup.9528000000004028 is null
Although the net value shows, even when I choose VAT from tax 1 and 2 the sums don't add up, so am I doing something wrong my end.

I'm using Firefox 2.0.0.14 and XP SP3. I tried Explorer 7 but discovered that the jump menu where you can add an item won't pull down and I can't add a new line or add prices etc so don't know if that is anything to do with SP3 as only installed that last night.

Regards

Brian