Hi all
Unfortunately I'm not familiar with Wireless Sync application my self as I'm not sure if this is something that we can download and install on any of our QA devices :/ (I will have to investigate this some more), but reading the description of this issue here I'm guessing that Wireless Sync application include some code with it that will "override" the current selected calendar application on the OS each time it is launched, and therefore if you launch it once it will override the Papyrus registration on the OS as the default PIM application.
I've added this post as something that we will be investigating some more with future upcoming updates of Papyrus but it is still hard for me if this is something that we will be able to resolve, but after we will investigate this some more it will be much easier to tell