Try this extension
https://chromewebstore.google.com/detail/easy-session-manager/jggdlmooodfanhnhkgpfhaceofhelpnl
or this one
https://chromewebstore.google.com/detail/tab-restore/dbndgjfafojhfndfgpcibceghelbbnep
Read the Tips section.
X64 Portable has decided to reenable cloud synch again. I am unsynched and on Guest account only. Theme has also been set to default and extensions were all enabled but hidden from toolbar. This is happening far too regularly.