Summary
"The file ... Action.c has been changed externally. Do you want to reload it?" message wrongly appears in VuGen 12.01. The problem is related to McAfee antivirus running on the VuGen machine.
Error
"The file ... Action.c has been changed externally. Do you want to reload it?" message wrongly appears in VuGen 12.01 which is installed on Windows 8.1 Operating Systems.
Cause
The problem is related to McAfee antivirus running on the machine on which VuGen is installed.
Fix
Please disable McAfee antivirus to overcome this issue.