Fortis,
I downloaded and updated to SIGPro v3.6.0PR1 and K2-master.zip.
1. K2 is still displaying version 2.9.0 on the bottom of the admin area. I want to double check with you if I got the correct dev version.
2. I cleared browser cache, but the Close button is still not working. I checked the console by opening the edit window in the new tab, reload the edit window, and I saw the message attached.
Thanks,
N