Rexomus -
SUPER SUPER HELPFUL! Thank you!!!!!
Ryan,
An Adobe tech helped me resolve this issue. Please follow these steps:
The tech had me open Pre Pro CC and go to "help" and click "sign-out". When you do that a pop-up appears saying that: signing out will deactivate the following software on this computer unless you sign in again; following with the icon for each Adobe CC app i have installed.
Next the tech had me open Pre Pro CS6, which upon opening askes you to sign in which I did. Once Pre Pro CS6 was open, The tech had me check under "help" to see if the the option "deactivate" was available or greyed out. For me, It was greyed out.
Next the tech had me close Pre Pro CS6 and open it again and check "help" to see if deactivate was still greyed out; and it was still greyed out.
Next the tech had me close Pre Pro CS6 and open Pre Pro CC which prompts you to sign in. After Pre Pro CC launched the tech had me close it and open Pre Pro CS6 again too check under the "help" tab again and confirm if "deactivate" was still greyed out or black (executable). This time "deactivate" was black.
Next the tech had me launch Encore CS6 tto see if it still required a serial number. This time Ecore opened as it should, without requiring a serial number.
Hopefully this stick, or Adobe includes a perminant solution in the next update.
I Hope this helps others with this same issue.