hoo00, if you have a general backup of your FreeSpace folder, simply restore/copy the folder MjnMHs-1.4.3 back under your x:\GAMES\FreespaceOpen\FS2 folder and everything will function again (it's how I fixed mine). If you don't have a backup, then simply open Knossos, find the Freespace Upgrade MediaVPs mod, click the down-arrow to expand the context menu, and select Modify. In the mod list, find the subheading MjnMixael's HD Mainhalls 1.4.3 and make sure it is checked. To save time/space you may want to deselect some of the mainhalls since some are tied to specific optional mods and not the main FS1/FS2 campaign mods. The main ones you really need checked are the audio files, the Galetea files, the Bastion files, the Aquitane files and, if you have Silent Threat installed, also include the Krios and Soyakaze files as well. This will redownload the Mainhall 1.4.3 mod again (which could take a while, since it's pretty big - 4.5GB).