FortiClient for iOS no longer working

The most recent update to the FortiClient iOS app has prevented me from connecting to the company VPN on my iPhone and iPad.

Our connection uses a password and not a certificate. I've tried toggling the "Hide invalid certificate warning" option and that doesn't make a difference. The message I get is "Connection error. Might be server certificate validation failed. Make sure you installed the right CA."

I use FortiClient on a couple of Macbooks and that client continues to work for me. It's just the iOS app that is failing.

Version is 5.4.0.121.