Please check all your (system) apps, if you have the correct version (1.12 Patch 6). if not please download it from the collaboration room link to system apps and install it (like descriped at the releasenotes).
If you have still the same problem. Please try following steps.
Clear the browser cache (STR + F5)
use another browser (Chrome, Firefox, ...)
check the license of the PLC.
make sure that you have the correct version of the PLC app active
Open PLC Engineering, start new default project and try to connect to the ctrlX CORE.
If all this not work, please download the system image and install it at the ctrlX CORE.
Regards
Jochen
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