So my favorite obsession, helplines, have developed a new wrinkle. I do a delete all using the helpline manager but it just looks like they are gone:). As soon as I try to offset/edit a line that is drawn on top of a former helpline the helpline resurfaces and no more editing to be done. Only way I can get rid of the helpline then is to close the file and re-open - kinda slows things down. I have learned never to delete a helpline directly as that is likely to precipitate a crash...
I use the following command line alias to delete help lines.
3022# Save File
3026# Regen Display List
The key is to save the file and regen "U" the display to get rid of those ghost helplines.