I am new to WiX and am having a problem displaying a message box to the user from a CA in a C++ DLL. I have an MSI dialog that asks the user to enter their serial number and calls my CA when the user presses Next (Execute="immediate"). The CA is getting called and I can retrieve the serial number using MsiGetProperty(). However, I can't get MsiProcessMessage to display a message box if the serial number is invalid. If I run the install with logging, the correct message shows up in the log. As a test, I used the same code in a deferred custom action during the uninstall and the message box shows up properly. Is there some restriction on when MsiProcessMessage can display a message box?
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