Dear Per!

Anyway, these are the only two "problems" I have encountered with the version I'm using (which is, I believe, 1.6).

I'm also using the forum for some years. I would strongly suggest you to update to the current version (1.7.3) since some security problems (ie, JavaScript-Injection) were resolved. Also the optional captcha is a quite nice thing.
Go to the admin-area > forum settings > advanced settings
In the last line you see your current version.