When we upgraded to News Show SP2 version 2.9 in our test environment, selecting "Blog" for the date format causes the page with News Show to break with a white screen (and very little code in the source). Selecting the other date formats work. And it works in our production environment with version 2.2.
I upgraded first and, when the extension didn't work, I uninstalled News Show SP2 and installed it again fresh in the test environment. So this is a fresh install.
Here is a link to the News Show SP2 v2.9 module in our test environment with most of the default settings in place and the date format of d F y selected. It is working.
http://204.12.202.174:8009/marketers/index.php/about-us/company-news
Here is a link to an exact copy of the same module on a copy of the page -- the only difference is that the date format selected is "Blog". (I did test it with a diffferent date format to make sure it worked and then changed it to Blog.)
http://204.12.202.174:8009/marketers/index.php/about-us/company-news-2
Here is the production version using v2.2 with all our settings including Blog date of the module http://marketers.familyfeatures.com/about-us/company-news
We are running Joomla 3.4 with Shaper Maxima v1.2. We have set an override of the date format set to l, F d, Y