Working izap plugin is suddenly broken

All has been working fine up to today.

I too am now receiving a message stating 'Please install PDO sqlite drivers to enable onserver support.'

I am now not able to select onserver videos in the Izap settings.

Also, under each widget on Profile page or dashboard, the following message is shown:
Fatal error: Call to a member function query() on a non-object in /home/**domain**/public_html/**subdirectory**/mod/izap_videos/lib/izap_sqlite.php on line 193

No server settings have been changed.
I did upgrade to Elgg 1.7.1, but that was last week, and it has been working since then.

Does anybody have any ideas, please?
Thanks