among the many Guests, i am using from my debian-stretch box is one Win7 VM used for gaming (mostly). Until yesterday, i was still on VBox 5.1.34, today, i upgraded to 5.2.8. Unfortunately i did not install guest additions during my preliminary tests. But now, after installing them, i am getting errors (caused by a program in autostart, that is using more graphics). (2 messageboxes showing the error uploaded).
Just for fun i went on to start from a snapshot without the new GA (still on 5.1.34) and there, the only problem is, that vbox is asking for the newer GA's to be installed.
What to do from here?