I've been editing for an hour in Firefox. I've just tried to add a wikilink. The problem is that the label is plural, and the link needs to be singular. No problem: edit the link.

Hmm, "congenital abnormality" is a redirect. The actual article title is "congenital disorder". No problem: backspace over the words. Oops, I took out the space. No problem: type a new one.

Hmm, no space. I can't get it to give me a space! It wants to search for "congenitaldisorder", all one word.

Confirmed on:

• Google Chrome 41.0.2272.118 m
• Firefox (unknown version)