opening a VM gives NS_ERROR_NOT_IMPLEMENTED

[victorn-dev]

My server is running vboxwebsvr with self signed certificate
The VM's show up correct
Data about the host is correct

But clicking a VM icon gives this error in the server
00:00:35.286212 SQW02 API method name: IMachine::ReadSavedScreenshotToArray
00:00:35.286268 SQW02 API return code: 0x80004001 (NS_ERROR_NOT_IMPLEMENTED)

All info on the VM is empty (memory/processors etc) with a SOAP-ENV:Client' faultstring: VirtualBox error: rc=0x80004001' faultfactor: 'null' detail: org.kxml2.kdom.Node@...... popup

Figured it would be a rights issue but running the vboxwebsvr with sudo makes it worse. No VM's are shown in that case