This is a problem I've run into over and over again. Eventually, my ORD drainage files often become corrupted and unusable. Eventually, it gets to the point where when I try to open the file, I simply get an "abort, ignore, retry" error message, but whichever option I choose it just kills the program. I have been working in ORD for 3 years now and have continued to have stability issues with the drainage portion of the software in particular.