Noticed time in Back Office > System was an hour behind.
$date_default_timezone = 'Europe/London';
Same old story
2 errors unescaped ampersands
9 errors on calendar.
1 and 2 Un-escaped &s Suspect as in version 5:
[/inc/widgets/widgets/_user_login_widget.php] &redirect at Line 226
[inc/users/model/_user.func.php] Lines (198,212,214,2x225,270,736,1766,1835,2x3162,3849,2x 3851,3853,3857,3869,3884,3899,4372,4379)
Only did the green numbers as this fixed it for now. Think it's just line 225
3. Cellspacing not valid attribute
4. summary not valid attribute
6 to 11. 'attr' not valid attribute
Line 437 removed cellspacing="0" and replaced the word summary with title
line 452 removed abbr="[abbr]"