virtualbox.org

When starting a Windows 7 VM on a Mac OS X (Mavericks) and VirtualBox 4.3.0 host, I get the following warning:

"The virtual machine window is optimized to work in 32-bit color but the virtual display is currently set to 24-bit. Please open the display properties dialog of the guest OS and select a 32-bit color mode, if it is available, for the best possible performance of the virtual video subsystem."

The warning disappears a few seconds later (I couldn't find any way to keep it on display, so that I could study it), and the VM appears to operate normally thereafter.

Note: I made a simultaneous change from Mountain Lion to Mavericks and 4.2.18 to 4.3.0 (no hardware changes). Under Mountain Lion and 4.2.18, this warning message never appeared.

1. Is there a place where such warning messages are logged, so that I can view this one in less haste?
2. Any ideas how to prevent it from appearing in the first place? When I go in the VM to Control Panel .. Appearance and Personalization .. Display .. Screen Resolution .. Advanced settings, under the Monitor tab it does say "True Color (32-bit)".

TIA,

Mark

Did you update the Guest Additions in the guest after you did the update from VB 4.2.18 to 4.3? How about the Extensions Pack?

refer to How to disable popup overlays in VirtualBox 4.3

And, therefore, I am ignoring the message now

Yes, I updated Guest Additions immediately after updating VB. The Extensions Pack has never been installed, so did not require update.

Yes, I saw how to remove the warning, but I would rather address the underlying cause.

Mark