Ok. I am new to this board but have been playing with VBA for a couple of years. A workbook I have developed over a year now randomly decides to crash. Sometimes it fails to find an object, like a userform, that absolutely exists! On restart excel usually finds unreadable data in the xlsb file. I had the file open when the computer locked up a week ago. I had to have IT reinstall the entire office suite again to get it working. Since then I have copied the contents of the file (macros, forms, sheets, etc) into an entirely new xlsm file but the problem persists. I can post whatever data about the crash will help if someone can tell me what to provide. Sorry, long post, HIGHLY frustrated!!!