MessageBox不能在某些机器的测试中工作但在dev中工作

Question

我在我的应用程序中使用了messagebox。它在我的开发中工作得很好但是当我部署它进行测试时，它不会弹出一些用户。这是我的代码：

StringBuilder sbInstructions = new StringBuilder();    
    sbInstructions.Append("Open a browser");
                                        sbInstructions.Append("Click Submit\n");
                    sbInstructions.Append(string.Format("Save the file as {0}, to the following path {0} \n", CsvFilePath, Path));
                    sbInstructions.Append("Close the browser\n\n");
                    sbInstructions.Append(string.Format( "Open the CSV file in Excel and save as an XLS with the filename {0} where YYYYMM is the month/year \n", FilePath2));
                    sbInstructions.Append("Close Excel\n\n");
                    sbInstructions.Append("Click OK when ready to proceed\n\n");
                    sbInstructions.Append(string.Format("NOTE: These instructions are saved at {0}DL_Instructions.txt to allow for copy/paste\n\n", Path));

                    File.WriteAllText(Path + "DL_Instructions.txt", sbInstructions.ToString());
                    MessageBox.Show(sbInstructions.ToString(), "Instructions", MessageBoxButtons.OK);