Never change a running system....., but IT didn't care and updated Office 2003 to 2007:

My little VBA Macro reads selected data from a text file into Exel and generates also some diagramms. It worked fine with Exel 2003, altough some data sheets were close to 256 columns and 65k rows.

Excel 2007 seems to run like a world champion, but after a while it "calls mum back home" (Microsoft, because software crashes) without giving me a chance for debugging.

If I run the Macro step by step (manual stops in source code), Excel 2007 seems to have no problems at all!!!!!

At one incident an error message regarding data overflow in a diagramm popped up, before Excel 2007 crashed. Unfortunately I could't repeat this message.

Is there anybody out there who has experienced such cumbersome behavior?

Thanks for the reply in advance.