Timeslips 2015 Outlook Addin not working properly

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I have installed Timeslips 2015 and everything seems to be working as it should (although it is quite a bit slower than TS 2011), except the Outlook add-in.  When you first load Outlook the add-in is there and working - I can create or reply to an email click the button (it will change to pending) and then when I hit send a few seconds later a window will pop up where you can create a new slip, which is what I believe is suppose to happen.  At this point the add-in no longer works, in fact if I create a new email or reply to one the add-in doesn't even show up.  I have tried this on most of the computers in our office with the same result - most computers are running Windows 7 64bit and Outlook 2010.  

Can someone point me in the right direction to get this figured out?