Question: Velks Lab

[CmaN]

I just had a few quick questions regarding Velks. I'm not very familiar at all with the innards of the zone, so I've started to explore deeper. Last night, I was playing around the castle area, and was up near the front (?) entrance of it, invis and horsing around waving to some friends up at frenzy. Being unfamiliar with the area, I was obviously conning everything looking for see invis. I started to walk to the right of the entrance area and my invis just dropped without warning. I took a swift dirtnap after that.

My question is, was this a dispel trap? I cannot find it marked on any maps.. Do you get any indication in the log of when you trip a trap? Finally, since I want to go back and explore more, are there any other obvious places or things I should keep an eye out for to save the corpse summon+EE res?

Thanks a bunch!