It sounds like Encore might not have installed correctly. Might try uninstalling Premiere Pro and reinstalling it through Adobe Application Manager, when going to reinstall, might try right-clicking on Adobe Application Manager and choosing Run as Administator on Windows or in an new account with admin rights on Mac.
Hope that helps,
I have had the same issue and have tried your suggestion but to no avail ... please help!
For Info: I am on the freebie membership at the moment to see if I will benefit from either purchasing the products or a full membership.
I look forward to your advice.