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Please check whether you have McAfee v7.1 configured to do On-Access Scan. If you do want to scan the application on access, then make sure designer .exe is not added in the High-Risk Process list.

On McAfee virus scan the toolbar item, right click and
Choose "On-Access Scan Properties"
Choose "All Processes" on the left hand side
Choose "Use different settings for high-risk and low-risk properties"
Choose "High-Risk Processes" on the left hand side
Choose the "Processes" tab   and Remove designer.exe from this list if exists.

For more details contact support@tibco.com