Same problem updates to 4.2. Appeared that the core update also hung.
Refresh fixed that issue.
Updated 4 plugins and site went into maintenance mode for long period.
Then finally returned with each plugin failed due to write permission on plugin directory.
“could not remove old plugin”
But plugins had been deleted. Plugin list showed all plugins minus the four just upgraded.
Re-installing from plugin extension library resulted in error “unable to create plugin directory”
Only way to recover plugins was to install them via FTP.
Website host IIS 7
