com.sybase.jdbc2.jdbc.SybSQLException: Domain error during implicit conversion of BINARY value '’' to a DATETIME field.

at com.atlassian.confluence.core.persistence.hibernate.HibernateObjectDao$4.doInHibernate(HibernateObjectDao.java:310)
at org.springframework.orm.hibernate.HibernateTemplate.execute(HibernateTemplate.java:149)
at org.springframework.orm.hibernate.HibernateTemplate.executeFind(HibernateTemplate.java:473)
at com.atlassian.confluence.core.persistence.hibernate.HibernateObjectDao.findNamedQueryStringParams(HibernateObjectDao.java:291)
at com.atlassian.confluence.core.persistence.hibernate.HibernateObjectDao.findNamedQueryStringParams(HibernateObjectDao.java:276)
at com.atlassian.confluence.core.persistence.hibernate.HibernateObjectDao.findNamedQueryStringParams(HibernateObjectDao.java:261)
at com.atlassian.confluence.pages.persistence.dao.hibernate.HibernateBlogPostDao.getFirstPostAfter(HibernateBlogPostDao.java:99)
at com.atlassian.confluence.pages.DefaultPageManager.findNextBlogPost(DefaultPageManager.java:106)

The only visible symptom of this I can see is that you have to manually refresh a blog-post page after you've added or edited an entry, so that the button-bar will appear.