Display resolution problem with guest additions installed

[thunderguy]

Hello! Upgraded my latest Mac mini to El Capitan and virtualbox 5.0.6 without any problems, used it for couple of days, and suddenly today, my screen resolution in guest Windows 7 became 640x480 16 colors. Had to restart guest win7 after reboot I could use only square 1400x1050 resolution, like I had no guest additions installed. Tried to reinstall guest additions but with no luck. Please help me to return my wide screen 1900x1200 like it was before glitch.

[loukingjr]

Something had to change on either your Host, i.e. installed new software, changed VB settings etc., or something in your Windows 7 guest changed due to updates or corruption etc. Software doesn't spontaneously stop working unless you have a hardware failure.

attach the vbox.log for the Guest…
With the VM fully shut down, right click it in the VB GUI. Select "Show Log" and save "VBox.log" (ONLY) to a zip file. Attach the zip here.

[thunderguy]

Only plugged Samsung earphones in my Mac mini, nothing more have changed, will attach log file later.

[loukingjr]

If you have Elmedia Player installed be sure to uninstall it. It causes numerous problems in OSX 10.11

[thunderguy]

If you have Elmedia Player installed be sure to uninstall it. It causes numerous problems in OSX 10.11

No i don't have it. All was working alright, but suddenly after switching from os x to win7 win7 screen resolution has changed, and now it's not wide

[loukingjr]

Does Full Screen (Host+F) work?

[thunderguy]

now i can see wide screen resolution 1920 x 974 but it's little bit smaller then my previous resolution. I want 1920 x 1200. I didn't do anything just rebooting vm and now i have a new resolution. That's going on. Log is attached.

[thunderguy]

Does Full Screen (Host+F) work?

yes it works

[loukingjr]

With the guest open, From the View menu>Virtual Screen 1>Resize to 1920x1200.

[thunderguy]

oh, i figured out how to get new resolution. I switched to seamless mode and received this wide screen resolution, than switched to full screen mode and than back to seamless mode and now i get to wide screen resolutions, 1920 x 974 and 1920 x 977. What's happened?

[loukingjr]

see my previous post.

[thunderguy]

With the guest open, From the View menu>Virtual Screen 1>Resize to 1920x1200.

sorry but i can't find such menu. Then i open view menu i only get different screen modes like full screen and scaled and seamless mode, but no menu with virtual screen

[loukingjr]

You don't see this?

[thunderguy]

You don't see this?

I had virtual screen then i used to monitors configuration but now i use one monitor configuration and don't see such menu

[loukingjr]

restart VirtualBox with one monitor set.