Webcontactsheet WARNING

After a 8 hour editing session, I was trying to create a webcontact sheet of around 650 files. At the beginning of generating the program halted with an error message "error creating webcontact sheet". The program halted and there was no way to quit the program (no response) so I quitted the program by means of the taskmanager. But to my surprise all the raw files (1045) where gone and so were the setting files with all the adjustments. 🤬 🤬 🤬 🤬 🤬 F&*ck. 8 hour work down the drain, talking about efficient workflow. 😭