WordPress version: 3.5.1
WordPress SEO version: 1.4.3
I did this: installed plugin and left everything default except for generating an xml sitemap
I expected the plugin to do this: not rewrite titles without that feature being enabled
Instead it did this: rewrote blog page title to be <site name> | <BLANK>
instead of Blog | <site name>
Force rewrite titles setting was not enabled. Disabled plugin and issue disappeared/ re-enabled and it reappeared.
My hack solution was to set the Titles & Templates > Post Types > Pages > "Title Template" value to %%title%% | %%sitename%%
Seems strange that its rewriting only the blog page title. I might look into the code but this solution works for now.