All of the sudden my keyboard delete button doesn't erase the objects I have selected. Any suggestions?

Outside of Autocad is the Delete button working? If not maybe its just worn out.

Try the PICKFIRST variable or the tip:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=3407

If the delete button isnt broken it is probably the Pickfirst variable. Type pickfirst on the command line and make sure it is set to 1.

pickfirst was the answer