32-bit color (Win7 Guest, Mavericks Host, VB 4.3.0)

[Mark92630]

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

[rpmurray]

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?

[ChipMcK]

refer to How to disable popup overlays in VirtualBox 4.3

And, therefore, I am ignoring the message now

[Mark92630]

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