I removed them because, in my opinion, they all looked ugly. I haven't found a single WordPress theme the default Propel themes actually worked well with. Propel 2.0 made it easy (for anyone with basic knowledge of PHP and an ounce of motivation) to integrate with your theme (granted, I haven't provided any documentation on this, but it will be out in the coming days). Plus, with even less effort, you can use the jQuery UI theme roller to create your own theme. I opted for this route because it allows for full customization and it is one less feature I have to maintain, which allows me to concentrate on more imperative project management features.
Can you take a screenshot of what you are seeing? The progress bars *should* appear, and I'm not sure what you mean about the clients. You are more than welcome to go back to 1.7 - there are no security vulnerabilities that were patched in 2.0 that you need to be concerned with.