PRE format sees a space added before and after a URL
Example below is "string1 http://a.url string2", however wpforo adds an additional space before and after the URL.
string1 http://a.url string2
Testing reveals the "://" is the trigger for this. This problem does not occur if add such a string to a wordpress page so TinyMCE isn't causing this.
Can it please be fixed in the next wpforo release?