If you're interested in more details, the floor text in question is set up in (I suppse) a rather complicated way - you see, it is beside a teleporter at the end of a section. The aim in this section is to get a key and the teleporter sends you back to the main central area where you choose which path to go down (you have to get a key from each). I've got it so that the text only appears if you haven't picked up the key - the text is set as invisible but the alcove in which the key is found is a trigger - as long as the key is in the alcove (constant weight), the text is visible. So if you haven't seen the text and you take the key, you don't get the text when you go to the teleporter. Hmm I think I made that sound really complicated and should probably have just stuck with that first paragraph but meh
