I am a little confused. At what point was the error message given? On opening the project? Editing a topic? Also can you confirm where the source files are located (e.g. a network - extremely bad - or local drive - good).
The crash occurs, when I re-open my project which is located in my c-drive. I used the tip (from one of the forum) to delete the CPD file from the folder and I was able to open the source file. I was very happy to see my source file back, but my TOC got lost It is a great pain to recreate the whole TOC. Any suggestions?