Yup I lost a whole Tileset once, good thing I had a backup of it. Not sure why it happened tough.
Never happened to me. You are not, by any chance, running this from Steam, are you?
It's happened to me before, and outside of RM as well. Sometimes it's file corruption, and sometimes I simply accidentally moved it to another folder.
@ksjp: it is but always run from offline to mitigate the problems inherent with steam and non-typical game software.
@Susan: If it's file corruption than rpgmaker deletes it's corrupted files, I'll load it up and random tilesets will be missing. Doesn't seem to have any rhyme or reason to it, odd that I've had ace for years though and this is the first time I've seen resources disappear on me.
System Update / System Restore removed some of my files or set them back to previous versions. Even though my project was in My Documents, which is not supposed to be touched by those programs.
If you have multiple versions of your project, it could be easy to get them mixed up, especially if you open Ace via the Ace icon and not by going into the folder and double-clicking on the project file.
I hope you manage to find the cause of the problem soon. Vanishing resources can be a real pain.
Separate names with a comma.