Ok, so I've found the problem. It has to do with currency conversion. I changed the default currency from AUD to USD in the Magic Preferences section, and it's all fine now. I need prices to be visible in local currency though, so this is a workaround, not a fix.
Sorry. Log file attached.
Have updated to 1.5 - the same error still occurs.
upgrading to 1.5 is a manual process? (i.e. doesnt get picked up with application update checker?) will download and install 1.5 tomorrow. Thanks.
Second screenshot to demonstrate error with different filter / card info.
Error has occurred - Index: 1, Size: 1