Up to 1.4.3, the page title used to be [sitename.com] - [page title], but as of 1.5.1, the order changed to [page title] - [sitename.com].

Is this change intentional?

This is an issue included in ARTIO JoomSEF Mambot. You can change the order of page title and sitename by "Use sitename in page titles" parameter and setting it to "Yes - before page title".
Bye

Hello,

yes, ingbl is right. There has been added possibility to configure this in 1.5.1. You can change the default behaviour by configuring the JoomSEF metabot.

The sequence [page title] - [sitename.com] was configured as default because it better reflect content of each page and thus should be better for SEO, if you have you pages named effectively.

Best regards,
ARTIO Support Team

In 1.5.1, the title tags option for every url doesn't work. Seems to be a bug, in 1.4.3 it's working.