Just installed Ver 4.2, following directions. Moved MM files from \CDBK30\... to \MMortals\... as recommended. Problem with the Business Object Builder when changing CErrorMgr. Error message: isclassinlibrary.prg not found. I think this function resides in Utility.prg, which indicates to me it is not loading as a procedure file. Also, manually changed APPINCL.H to get the paths correct. Any ideas?