v2.50 MR10 to v2.80 VPN CLient and Email Alert Issues

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We have just updated our FG50A to access the new features of 2.80 MR5 and have found that we can nolonger connect outbound to other units using IPSEC VPN or indeed inbound to our own site. PPTP is however still ok. Have tried/found the following: - Downgraded to 2.5 MR10 (includes warning and reset factory default) Fully configured all rules, users, spam detection, email alerts and logging to syslog server Tested outbound VPN Client access at each step above for connection and ping success Found intrusion prevention causes ping failure through tunnel Disabled intrusion prevention, VPN client fully functional rebooted all still ok Post 2.80 MR5 upgrade Upgrade process warned of reset to factory defaults but retained all settings except logging of outbound general NAT and encrypt rules Enable logging on the two above rules Retained correctly configured email alerts entries, however attempting to click on accept causes " invalid email format" error (This has been noted in other postings) Clicking the test button with the retained alert settings sends alert test email Tested outbound VPN client OK Tested inbound access from remote location ok Following day tested outbound VPN, session connects to remote site ok but no ping, telnet SMTP or other responses Tested inbound VPN same as above Also noticed that CPU utilisation periodically creeps up to 100% and causes slow GUI response but have not yet associated this with any particular activity Any ideas? Think I will give up the extra features and drop back to v2.50 MR10 until v2.8 is fixed