I do not think that I customised anything significant apart from changing the content of the articles or adding additional articles. I have never used or seen the website you indicated. The only thing I did relevant to a blog page was reformatting it into one of the regular pages. I do not remember which blog page it was, but it all worked fine prior to the upgrade. Although I cannot say for sure, but I think these troubles started utter the upgrade to the latest version of the template, which happened a couple of days ago.