If main is saturating the CPU, Help/About makes the app modal, but no dialog is displayed. The bug occurs with any dialog created via DoModal, but it does NOT occur with the common dialogs (e.g. CFileDialog), presumably because they use a different creation method. Help/About is currently the only non-common modal dialog accessible directly from the main menu, which is why the bug wasn't discovered earlier.
One workaround is to disable the main timer in CAboutDlg::OnInitDialog, and then re-enable it in ShowWindow. An easier one is to do an explicit ShowWindow in CAboutDlg::OnInitDialog.
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