Hey LindyMH,
It's great to see you giving the browser version a go, though we can imagine how this hiccup might throw you off. The “[DecimalError] Invalid argument: undefined” happens when a recurring transaction in AccountRight has a line that's missing an account number selection. The browser version is a handy option for flexibility, but there are still a few features from the desktop version that haven’t made their way to the browser. If the fix we've mentioned above didn't work on your end, you can reach out to our team on Live Chat via our virtual assistant, MOCA, or by submitting a support case via MyAccount.
Cheers,
Doreen