OpenVPN server certificate verification failed

OpenVPN server certificate verification failed: mbed TLS: SSL read error: X509-Certificate verification failed, e.g. CRL, CA or signature check failed." 

Started getting this error. Based on some reading seems it occured when Open VPN updated thier app. Using same keys created a few months go, Open VPN displays the above message when using Android. However, W7 64 bit continues to work,

Need COMPETENT help from Netgear to explain why. Downloading, reinstalling, repeating what I wrote is NOT considered competent help. If you can't answer the question, admit so and forward it internally to someone who can. Time limiit is 2 business days before I escalate it to BBB.