video memory invalid setting

[ciamurra]

VBox 4.3.12

Host System:
Macbook air 12.4 GHz core i7
OS X version 10.8.5
VirtualBox 4.2.16
Memory 16 GB 1600 MHz DDR3

Video details:
Intel HD Graphics 4000
NVIDIA GeForce GT 4000

Guest
Windows 7 SP1 64-bit

I'm installing Windows 7 Guest in Host Mac OS X 10. I'm advised that the video memory setting of 18 MB in invalid; should be a minimum of 21 MB. But in Settings/Display I can't make any changes. The 18 MB was an automatic entry during the installation of Win 7.

[BillG]

18MB is the default setting. If you need more, increase it.

I can't think of any reason why you not be able to change it unless you tried to do it while the vm was running or in a saved state.

[ciamurra]

I don't know why the video memory scale slider and up/down arrow were both were both greyed out. In any event, after rebooting I was able to increase the 21 MB that appears to be the minimum for Win 7. Thanks