I am working with a test drive DC 11.06.00. Drawing size apparently is at the size limit allowed, I think, owing to the .arf and .arb sizes rather than the aec size: .aec = 707 kb, with the .arb and .arf at about 5mb (when present). Even with layer search on, I cannot erase drawing entities in an effort to reduce the .aec size. Is there something obvious I might be neglecting?
You can't erase any entities? Is your Layer Search On or Off? If off you can't erase anything except enities on the Active Layer. Check to see if it is on or off.
Also do you have any locked layers?