Pingbacks won't work with PHP 4.2. opensocket() implementation seems to be buggued in PHP 4.2. Pingbacks work fine with newer versions of PHP. Please note that pingback implementation itself was buggued in b2 but has been debuggued in b2evolution.
Category: "Known Issues"
b2evolution (as all other b2 versions) does not currently implement database transactions. This is due to the fact that mySQL has not been supporting transactions for long enough by now to assume they are commonly available on hosting services.…
UTF-8 and Japanese support is still preliminary and not regarded as a stable feature. We are working on full double byte charset support for a later version. [Sakichan]