Description
One cause could be that you are accessing the block in Debug mode (SCL or STL). Values could still be forced in the CPU.

Remedy

• Terminate forcing and remove the connection cable. This terminates the Debug access.
• If this doesn't clear the problem, do an overall reset for the CPU.
• For test purposes download a DB. In this way you can determine whether the problem is connected specifically to the block displayed or whether no blocks at all can be loaded into the CPU.