Okay, have been having a play and noticed that I have some missing phrases. Also, the wiki blocks are not showing. I saw them very briefly after the upgrade but since then nothing.
On phrases, I am, for example, unable to promote a thread to a wiki page. This was happening before the upgrade today actually. I don't get a dropdown menu to select a category for the thread so when I save that page just to see what happens, vault attempts to tell me that I'm an idiot but can't find the phrase 'vw_invalid_area'.
I have cleared the vboptimise, vb and browser caches multiple times but no change.