Yes, I had this problem consistently for a while, but no longer! @EvilMonkey sent the following:
The issue you’re talking about with ‘links’ making your post disappear into the ether isn’t new. It’s just when you use the built in ‘link’ button/code from the post form. I think it’s supposed to be to block bots from posting walls of text with various nefarious links hidden within but it just ends up being annoying I know. You can however just post the link addresses and they are clickable within your post, you just can’t make them ‘pretty’.
In a nutshell, just copy the "htpp://....." string into your post as a text string and everything works.
Hope this helps
Andy