I've found 3 plugins that cause the warning messages in Widgets area for scalar errors. These are Top 10, Visitor Maps and Who's Online and Font Resizer. The last one is really outdated and should probably not be used in WP 3+ anyways. The first two are marked as OK for version 3.2 and later WP installs.
Hope this helps anybody else who might be trying to locate the cause of the scalar array warning messages. Takes some time to isolate and more than likely more like this will be encountered.
Also, setting the lazy loading option in the Widget and the throb setting do not always save the changes. Anyone else encountering this with v1.2.1 of this plugin?