The Props library content from my Poser 7 runtime abruptly vanished and I can't tell why.   The Props folder itself did not disappear, so I hadn't accidentally either deleted or moved the folder as a whole.   None of the content has appeared in the recycle bin, (or as far as I can see, in any other runtime).   Again, as far as I can see, the other Poser 7 libraries seem intact, as do the other runtimes in general.

I've re-installed Poser 7 and anything G2-related which had props in it, so I am roughly back to where I was before, but I'd be quite keen for this not to happen again. 

Does anybody have any ideas, please?