Can't open VirtualBox when Tunnelblick is active.

[virtualbio]

I have the same problem, but playing with the .xml files doesn't fix the issue.
MacOS High Sierra, 10.13.3
Virtualbox 5.2.8
When I start virtualbox (click icon), displays a message box:

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Unknown exception
/Users/vbox/tinderbox/5.2-mac-rel/src/VBox/Main/src-server/VirtualBoxImpl.cpp[554] (nsresult VirtualBox::init()).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: VirtualBoxWrap
Interface: IVirtualBox {9570b9d5-f1a1-448a-10c5-e12f5285adad}
Callee: IVirtualBoxClient {d2937a8e-cb8d-4382-90ba-b7da78a74573}

If I delete the ~/Library/VirtualBox/*.xml, (contained xml, not 0 bytes), the same result.

Log:

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~/Library/VirtualBox> cat VBoxSVC.log
VirtualBox XPCOM Server 5.2.8 r121009 darwin.amd64 (Feb 26 2018 16:54:24) release log
00:00:00.002293 main     Log opened 2018-03-16T13:45:02.938178000Z
00:00:00.002297 main     Build Type: release
00:00:00.002333 main     OS Product: Darwin
00:00:00.002341 main     OS Release: 17.4.0
00:00:00.002348 main     OS Version: Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64
00:00:00.002560 main     DMI Product Name: MacBookPro11,4
00:00:00.002641 main     DMI Product Version: 1.0
00:00:00.002685 main     Host RAM: 16384MB (16.0GB) total, 5350MB (5.2GB) available
00:00:00.002696 main     Executable: /Applications/VirtualBox.app/Contents/MacOS/VBoxSVC
00:00:00.002696 main     Process ID: 26762
00:00:00.002697 main     Package type: DARWIN_64BITS_GENERIC
00:00:00.005397 main     IPC socket path: /tmp/.vbox-name-redacted-ipc/ipcd
00:00:00.110654 nspr-2   VirtualBox: object creation starts
00:00:00.111076 nspr-2   Home directory: '/Users/name.redacted/Library/VirtualBox'
00:00:00.146293 nspr-2   ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={9570b9d5-f1a1-448a-10c5-e12f5285adad} aComponent={VirtualBoxWrap} aText={Unknown exception
00:00:00.146320 nspr-2   /Users/vbox/tinderbox/5.2-mac-rel/src/VBox/Main/src-server/VirtualBoxImpl.cpp[554] (nsresult VirtualBox::init())}, preserve=false aResultDetail=0
00:00:00.147224 nspr-2   VirtualBox: object created
00:00:05.153672 main     VirtualBox: object deletion starts
00:00:05.153723 main     VirtualBox: object deleted

If I run

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/Applications/VirtualBox.app/Contents/MacOS/VBoxSVC

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***********************************************
Oracle VM VirtualBox XPCOM Server Version 5.2.8
(C) 2004-2018 Oracle Corporation
All rights reserved.

Starting event loop....
[press Ctrl-C to quit]

If I then run run virtualbox (click icon), the above VBoxSVC outputs:

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2018-03-16 13:37:26.756 VBoxSVC[26488:199567] -[__NSCFArray _fastCStringContents:]: unrecognized selector sent to instance 0x7fbba9d0be10
Informational: VirtualBox object created (rc=NS_OK).
Informational: VirtualBox object deleted.

This was happening yesterday; I upgraded virtualbox, updated MacOS, rebooted, and vb started working. This morning it worked for maybe 15 minutes before vagrant suddenly exited, and virtualbox no longer started.

[virtualbio]

Ah. Virtualbox won't start unless all my VPNs are disconnected. Virtualbox crashes if any of my VPN connections change state. Using Tunnelblick.

[socratis]

I split your post from "Can't open Virtual Box, "failed to acquire the VirtualBox COM object"" because it wasn't the same problem.

I don't know what Tunnelblick is doing to cause the crash, but from my limited understanding it's a front-end to OpenVPN, no? So does the crash stop when you don't run Tunnelblick, OpenVPN, both, none? Can you describe the situation in a little more detail?