VirtualBox manager not showing up

[realvirtualboxuser]

Hello, I have been using VirtualBox under Ubntu Linux 18 for two weeks without problem. However, from yesterday, when I double clicked on the VirtualBox app icon, it seems to launch but the virtualbox manager does not show up on the screen. I see the app is launched as it appears on the task bar. Clicking that icon show a small image of virtual box manager but I cannot get it to show up in the middle of the screen for me to interact with it. Could you please let me what to do?

[ChipMcK]

On the Right, the drop down of "Machine Tools" is the "Details" selection.

Some curiosity is helpful, yes?

[realvirtualboxuser]

Thanks for your reply but I cannot find "Machine Tools" on the right.

Perhaps I did not describe my problem clearly. Enclosed are photos for your reference.

After launching VirtualBox, clicking the icon on the dock on the left shows a small preview of the VirtualBox Manager. I cannot get it to show up in the middle of the screen so that I could start the virtual machine. Please refer to virtualbox1.jpg and virtualbox2.jpg (for closeup view)

Right-clicking the icon on the dock gives a few options but none of them allows me to make the VirtualBox Manager to show up in the middle of the screen so that I can click start to start the virtual machine. Please refer to virtualbox3.jpg

There was no such problem for my two-week use.

P.S. I cannot upgrade the photos due to very very small max allowed size of 128KB.

[realvirtualboxuser]

Hello, anybody knows what to do? Still have this issue.

[socratis]

It seems that somehow the VirtualBox Manager window coordinates are messed up. That information is stored in the "VirtualBox.xml" file. Mine for example looks like:

<ExtraDataItem name="GUI/LastWindowPosition" value="382,45,1153,1091"/>

The easiest way to "reset" the value would be to delete it, by issuing the following command:

• VBoxManage setextradata global "GUI/LastWindowPosition"

I'd issue the command without the VirtualBox Manager actually running, I don't know if they're applied on-the-fly.