"We're sorry, but we were unable to complete your request." - revisited again

Everything happens the same in IE, and I can't think of any other potential workarounds, so I've raised a support request, which, for future reference, can be done here. There's a known problem with republishing blogs, which I thought I might be hitting, but that one still allows new postings to be added, so is probably not it. Will just have to wait. Grrr! I was in full flow on the inadequacies of the railway service around here, particularly from Cambridge to London!