Here's another one 🙂
If you get taken to a strange screen when you try and post a message to a thread saying that it's been blocked and you need to contact customer services, etc this is usually because it's having trouble processing the quoted text within your post (for some obscure reason). If you simply rewrite your message and post it without the quoted text this can often solve it.
This can also happen when submitting reviews. In that case it's usually because you've used brackets, so rewording and removing those can then allow you to get it past that 'blocked screen'. (credit to Smultron for figuring that out 👍🙂)
If these tips don't work for you check to see if you've used any other special characters like an & or an *, etc and try rewording/rewriting/removing those.
Hope this works. 🙂