Upgrade to virtualbox 4.3 caused many problems

I updated today and the new version of virtualbox was installed. When I loaded it to run some vms, I got this:
One or more virtual hard disks, CD/DVD or floppy disk image files are not currently accessible. As a result, you will not be able to operate virtual machines that use these files until they become accessible later.
Press Check to open the Virtual Media Manager window and see which files are inaccessible, or press Ignore to ignore this message.
All of my virtual disks are bad according to the dialogbox. Is there a fix for this?

maggie wrote:
I updated today and the new version of virtualbox was installed. When I loaded it to run some vms, I got this:
One or more virtual hard disks, CD/DVD or floppy disk image files are not currently accessible. As a result, you will not be able to operate virtual machines that use these files until they become accessible later.
Press Check to open the Virtual Media Manager window and see which files are inaccessible, or press Ignore to ignore this message.
All of my virtual disks are bad according to the dialogbox. Is there a fix for this?
I had a similar issue. When you start up VirtualBox and the error message shows up, click "check".
You'll see a new popup which has 3 tabs.
The first tab shows errors finding your VMs (if there are no errors an this tab: read on, if there are: might be a different problem)
The second tab shows errors finding 'optical discs'. In my case I had old references to /opt/*GuestAdditions. I removed these references using the context menu.
Reboot, still no luck (same error msg).
Downgraded virtualbox from 4.3.0 to 4.2.8-1. No luck
Reboot after downgrading: pacman -Syu
works.
Summary: (Untested) Reinstall virtualbox.

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