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Unfortunately i can't simply port it over to the max, as the application relies on WPF which is not available for the Max. Additionally i don't own a Mac.

Right now it is unlikely that i will create a Mac version. Same is true for a linux version.
I'm glad you like Wieldy.
I'm sorry for the problems.

First thing you should verify is, that you have installed the .NET-Framework 3.5 SP1. Please ensure that the SP1 is installed.

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If you're unsure how to check this, you can download the .NET Framework Setup Verification Tool. The tool can be found at:
http://blogs.msdn.com/b/astebner/archive/2008/10/13/8999004.aspx

Just run the executable and verify that the .NET Framework 3.5 SP1 is working.

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Alternatively you can do the following:
1. Open the internet explorer
2. Enter the following string into your address bar: javascript:alert(navigator.userAgent)
3. A popup will show up. In this window search for the string: .NET CLR 3.5.30729
Interesting idea. I will think about it.
Yes. Just double click the header (e.g. Items or Tools) of the ribbon bar, works the same like Outlook 2007/2010.
This has been implemented in beta V0.2.6.656. You can enable this inside the print window (To rightmost button in the toolbar)
You can now change the tray icon.