You've added a call to one of the dialog or message box functions to your SWF Studio application but it's not appearing. You've probably made the call in synchronous mode and it's probably one of the first calls you're making in your application. If so, here's an explanation of why it's happening and how to fix it.

The SWF Studio dialog functions (ssCore.App.showFileOpen, ssCore.App.showFileSave, ssCore.App.showFolderBrowser, ssCore.FileSys.fileSave, ssCore.FileSys.fileOpen, ssCore.FileSys.getFolder) and message box (ssCore.App.showMsgBox, ssDebug.msgBox) will only work when the main application window is visible.

SWF Studio only makes the main application window visible at startup when it knows that the main SWF has finished loading, which doesn't happen until sometime after frame 1.

The main application window is not visible immediately in frame 1 so if you have the following code in frame1 you will not see the message box appear and r.success will be false. This only happens when you enable and use synchronous calls to a dialog function in frame 1.

ssCore.init();
ssDefaults.synchronousCommands = true;
var r = ssCore.App.showMsgBox({prompt:"running"});

To ensure that your dialogs/message boxes appear when making your application use synchronous calls, all you have to do is make sure the main application window is visible before your dialog function is called. The easiest way to do this is to tell SWF Studio to show the window immediately.

ssCore.init();
ssDefaults.synchronousCommands = true;
ssCore.Win.show({}); // force the main window to appear
var r = ssCore.App.showMsgBox({prompt:"running"});

You may also want to close the splash screen (if you're using one), otherwise the splash screen will appear on top of the dialog/message box.

ssCore.init();
ssDefaults.synchronousCommands = true;
ssCore.Splash.close({}); // close the splash screen (if open)
ssCore.Win.show({}); // force the main window to appear
var r = ssCore.App.showMsgBox({prompt:"running"});