I have an Excel VBA workbook that has been distributed to many users. Some users are working with it without any difficulty. Other users ( a very small percentage) are receiving "Code Execution has been interrupted" errors. Using the debug feature the errors appear to be random with the program stopping on End Sub and End Function lines of code as well as other code lines. Single stepping through the code using F8 does not generate errors. The users having problems have the same Excel version and service pack as the users not having problems. Any tips on what could be causing the errors or where I should look?