How to solve "image files not currently accessible" problem?

[JN]

Every time I start VirtualBox Manager, I get a "VirtualBox - Warning" with the message about "image files not currently accessible". (See attached image.)

VirtualBox - Warning

VBVM problem1.png (11.19 KiB) Viewed 3779 times

When I click the 'Check' button, I get a hierarchical list of GUIDs for each VM, with one of them highlighted. (See attached image.)

Highlighted GUID file.

VBVM problem3.png (31.3 KiB) Viewed 3779 times

There is no other information given.

How do I fix this problem? How can I find out what is wrong with the highlighted GUID file?

[Perryg]

Click on the Optical Disk tab in your second screen shot and see what it is that is missing.

[mpack]

Quite often, the problem is that you updated the VirtualBox software while the old GAs was still mounted in a VM. VBox detects that the ISO has been overwritten: same name, different content. I'm pointing this out in case you're puzzled by seeing "VBoxGuestAdditions.iso" is the missing ISO, which is still present with the same name and path.

[JN]

Click on the Optical Disk tab in your second screen shot and see what it is that is missing.

The 'Optical Disk' tab?! Why the ... Oh. It has a different icon. And I'm guessing that's not the standard 'optical disk' icon. I never would have caught that. I assumed the selected/highlighted item in the 'hard drives' tab was the culprit. (Why else would it be highlighted?)

Thank you, Perryg, for setting me on the right track!

[JN]

Quite often, the problem is that you updated the VirtualBox software while the old GAs was still mounted in a VM. VBox detects that the ISO has been overwritten: same name, different content. I'm pointing this out in case you're puzzled by seeing "VBoxGuestAdditions.iso" is the missing ISO, which is still present with the same name and path.

You were mostly right. It was an .iso for another software package I installed, and I never 'ejected' that disk.

Thanks for the insight.