About ticket #533 (auto-target can work on...
Could it be that lurkers are considered "warm-blooded" instead of cold-blooded like they should be? Thus having infravision enables you to see it, but since it's a ".", you wouldn't know you're seeing it. Or the fact that the char reporting this was a "high-elf" having innate see invis.
Sorry if this has been considered already. Just thought I'd try to help, as I've never experienced this "bug".
Now I need to get packed for my 2 weeks vacation. See you all soon :)
ZAL