Caw FAQ's........Links to Tutorials, and Resources. Textures, & Troubleshooting

From reading other threads at MTS, I believe that means the global layer did not save properly. Make a copy of your most recent backup, and put it somewhere for safe keeping, then open up the backup in caw to make sure you can use that save. Are you using the EIG batch thingy-mic-****** to open the file up in EIG, or are you going in through Caw? Anyway, go into EIG again, do a minor tweak, and save. See if it was an isolated incident, or an ongoing issue.