i couldn't reproduce this problem, but since i just had another severe bug, I'll post this minor bug too:
maybe two weeks ago, i used a magic lamp to display some items and when i toggled several options (to show icons and names) on and off, and also changed the items to display a few times, i somehow ended up by having the names of some old items displayed after i had removed that item from the lamp, and when adding another item, its name was shown on top of the old name.

i could get rid of that effect by deleting the combinator and setting it up again, thus it is not gamebreaking, but it still is only an annoying workaround, and it would be nice if you could check where some instruction to remove old text is missing.