@title_mc_ch Just in case you haven't searched it yourself yet, I had this in my old bookmarks. Should be a good read for those wanting to keep using Menyoo. It discusses your issue in the post titled Spawning Interior Props posted on July 4th.
I know there is another way around the issue without having to be in the spot the object is located, I do believe it is posted on this site. I just didn't search it myself since I don't use Menyoo anymore.
If you want less hassles, try using CodeWalker. It has a slightly steeper learning curve than Menyoo or Map Editor, but it really is not difficult at all.