I am having trouble editing blocks in my library.
If I open or edit the block as normal I am now getting a water mark "INACTIVE" on the sheet and I cannot save the changes.
Can you post the files? If you do not want to post the files, send them directly to me and I will take a look at them.
I have emailed you two files, one is the block library and the other is the model I am using. However the problem is not model dependant.