Question: The `Devices menu` -> `CD/DVD Devices` contains `VBoxGuestAdditions.iso`  

**But ticking the above menu option doesn't show any menu to select anything from.**

The `kernel-devel` is already there.  

The host is `openSUSE 11.3` 64 bit. The guest is `Slackware 13.37` 32 bit.

What's the way round now?

Answer: 
You should try [Redmine](http://www.redmine.org/).

> 
> Some of the main features of Redmine are:
> 
> 
> 
> ```
> Multiple projects support
> Flexible role based access control
> Flexible issue tracking system
> Gantt chart and calendar
> News, documents & files management
> Feeds & email notifications
> Per project wiki
> Per project forums
> Time tracking
> Custom fields for issues, time-entries, projects and users
> SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)
> Issue creation via email
> Multiple LDAP authentication support
> User self-registration support
> Multilanguage support
> Multiple databases support
> 
> ```
> 
> 

(from Redmine homepage)

There is also a lot of plugins to extend it, and if there isn't a plugin that you need you can create your own easily. ;)
"Trac" might be an option for you.
<http://trac.edgewall.org/>