PHP Strict is a warnig (notice) message that is NOT a fatal error.
The PHP Strict message can be disabled into your PHP.ini file.
The only case that could cause a problem with these error is when they are displayed upon screen. Otherwise, this is not a problem.
As you can noticed, Joomla has still have PHP strict message as well as JMS.
You say stopped working for following reason but you didn't provided any description of the problem.
What is not working ?
You say it does not open the following menu.
Do you have a blank page ?
Do all menu have issues or just the 3 mentioned ?
Doe the settings menu working, about, layout, ...
The error log provided with "PHP strinct" is not the reason.
If you have a blank screen, you have to search for a FATAL PHP ERROR.
You mentioned that you move 3 joomla.
If you used JMS, theorically, you should have only 1 joomla.
Did you use the procedure described in the FAQ for the manual backup/retore ?
www.jms2win.com/en/faq/faq-joomla-multi-sites#cat-268