Thank you. I can definitely confirm querstions 1 and 2. This error has occurred on all 8 sites running on that host - not just one and the modules all have lower case names to avoid spelling mistakes - and some have been running over 10 years. I don't see how they can't be useable/readable as both the directories and the modules have 0755. I know almopst nothing of unix and as far as I know there is no "command line" anywhere. I think I'll write a snippet to read the module as a file to check