Hi,
Thank you that worked.
The issue was not really related to the update itself. You have a 400 (bold) font-weight set via CSS on all page elements, but the bold version of that “open sans” font is not actually loaded. Since the same font was used on ajax search pro, it loaded it automatically, and it corrected the issue.
I have turned off the font loader within the plugin, now it will be all right: https://i.imgur.com/WLBuKGh.png
I still hoever suggest correcting the font weight of the paragraph elements, as it is still set to bold (400), even though it is not rendered due to the missing font-face.