Cannot Install Apps and Copied .tgz Files Dissappear

When I copy .tgz files to the droboapps folder, they disappear and do not install. If I try copying the file again, it says that the file already exists. I try restarting, but the apps do not install. Any ideas?

I recently reformatted my drobo to HFS+ from NTSC and had no problems before. Could it be an issue between the droboshare and the new format?