Posting errors on mobile site

[Craikeybaby]

Sometimes when posting to the forum (or editing a post) on the mobile version of the site I get the following error:

[quote]Sorry!
An Error occurred. Please click a link in the navigation at the top of the page to continue.
There has been a problem with content delivery. 417 Expectation Failed

[/quote]

If I then navigate to the full version of the site I can post. It doesn't happen on every thread, maybe only 50%.

[Craikeybaby]

That first post went through OK, but editing a post previously didn't. Same browsing session etc.

FWIW I'm on an iPhone 5.

[slinky]

Have a nose here..