Virtual Box problems - no USB devices and broken package

[firenice03]

I downloaded what I believed to be the full extensions via the instructions in the LL manual, again, since I believe that this has been bundled in such a way that I should be following LL instructions. But despite this the mentioned problems have arisen. Should i uninstall and try to reinstall? Irritating, with a VM already set up...

No need to re-install... As mentioned you need the correct Extension Pack

As stated in the manual:

You need to know the version number of your VirtualBox installation in order to download the matching "Extension Pack". It should be version 4.3.10; but double-check that by clicking Help, About VirtualBox from the main VirtualBox window. Then look along bottom of pop-up window for the version number.
For the latest version, go to this VirtualBox webpage. Otherwise, go here, look for your version number and follow same steps as below to continue.

Find the "Extension Pack" listed under the heading for your VirtualBox version and click on All supported platforms to download it. Save the download to your Downloads folder.
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Update: Not sure if 4.3.10 is still the default as there are newer versions - double check your version as labeled.