I have created a dll that works perfectly in the debug mode. But when i try to build it for release or for that matter even use the debug version of the library on any other computer without the debug excel crashes and gives me the "excel has encountered a problem window". do any of you guys have any ideas what might be the reason? regards nikunj -- View this message in context: http://www.nabble.com/excel-crashes-when-using-dll-tf2319001.html#a6451273 Sent from the Haskell - Haskell mailing list archive at Nabble.com.