[xaldub]

Ok, nevermind. I've worked it out. Go into the save files for the character the chests are disappearing on and move the Backup and TQVault Backup folder to some other directory. Then go into the Levels_World_World01.map folder and select the level folder that the chests aren't working on. Select all files ( 99% of these are .que files ) apart from the "fow" folder and move them to some other folder of your choosing so you can get them back later if need be.

Next, start the game with the same character, run about a bit and the exit the game. Move your backup and TQVault backup folder back to where they used to be. Now ... the only other files I moved back were the QuestToken.myw , Quest.myw and map.dat files into the Levels_World_World01 folder. I did NOT move the old .que files back. If I did I found that nothing had changed ..and the chests would still be absent.

Hope this is all crystal clear ... more like clear as mud lol. My logic tells me the problem must lay within the .que files themselves. Somehow the data contained within changes and doesn't generate the chests anymore.