Edit Invoice bug: after editing an invoice clicking Save does not save changes

Edit Invoice bug: after editing an invoice clicking Save does not save changes

Using latest Chrome browser (19.0.1084.46) I have tried editing the description of a line item and it will no save. I also tried re-adding the line item and deleting the original; this will not save either. After clicking Save the invoice reverts to its previous state.

So I tried Internet Explorer 8, same problem.

Help? Thanks!