I am unable to delete a cline. When I hover the cursor over it, I get a message says it is fixed. When I select the cline and open my right mouse pop-up menu, the unfix option is unavailable. I tried to unfix it through the property-edit window, and the command window gave me an error message. 



Grouping may be preventing you from unfixing the cline. If you undo the grouping you can unfix the cline.