Definetly a bug, hard to reproduce and certainly annoying
I am working in a file with 20-100 lights. Experimenting with the light setup.
Light objects (linear, spot and rect) reappear on certain occasions 5 min after I deleted them.
In one occasion I changed render material parameters and on hitting the ok button in the material dialog, …bing… the rectangular light that I already deleted 5 times is back in the game. I keep deleting the same light objects over and over again. Hard to get any work done this way and totally weird behavior.
It seems to help to save, close and reopen the file to get rid of these zombie lights.
(maybe something messed up with the undo buffer, … just guessing)
I am using cycles atm, in case that is important. V6.4
Any hint and fixes much appreciated