In 3.x, I could simply start scanning a new receipt in to the folder in which I was currently viewing.
In 4.0, I can scan from that folder, but I have to go the Inbox, click on the receipt, choose the folder that I was just viewing, and then go back to that folder.
So... tell me how this is supposed to be an improvement? 
If you wanted to add the glitzy inbox to attract new users, fine, but why did you have to ditch functionality that worked just fine for experienced users??? Are you interested in losing users?
If you want to do something different, always give your users the option of doing the new approach or staying with the old approach.
For example, I use Windows Vista, but I have my desktop set up with the Classic Windows appearance. Why? Because I am used to it and more comfortable with it. At least Microsoft gives me the option to choose for myself--NeatWorks does not.
Steve