If you want to know if a portal is missing, get Crammyboy's portal detector off MTS2. If it's gone you need Erzengel's tutorial for getting them back. The things that cause the portal bugs we know about have been fixed by eaxis, so unless you are running base game only or uni/NL unpatched, you don't need any of the fixes for the problems.
Thank you for the helpful links. I do not have access to my game atm, but I shall try those things out when I do.
I haven't found the off world loiterers option on recent debugeers. Is it still there?
Is it a 'shift and click' in debug option?
I did check the shift+click options, and it wasn't there. Perhaps it is one of those options that is only available under certain circumstances?
A sim doesn't have to be visible to be physically present. In the case of a faded out sim still on the lot, they may wander and even socialize invisibly, though you cannot select them. As far as I know, the only fix for that may be to use a deleter (like the Deleter section of Insim or the Delete function on my teleport shrub hack).
This is entirely possible, esp if it is the case that the lot debugger only shows the option to Clear Offworld Loiterers when ther
are offworld loiterers. I'd rather not download the Insim zeppelin, but I have been meaning to try out your teleport shrub thing anyway. Thank you for suggesting it.