Scrollbar disappears in windows like gnome-terminal

Not sure if this is a Compiz bug, but it's related to windows management. The type of scroll bar used in gnome-terminal was also the same as that in Firefox before I upgraded my system to Ubuntu 14.10 at the same time I upgraded Firefox to version 34 or so (so either Firefox, or some other program changed how scrollbars look).

Switching to windows that use 'thin scroll bar', only ~3 pixels wide with no arrows

If done quickly, it works fine as long as the mouse cursor is pointing at the window being focused to. If done slowly, by pressing alt-tab and holding alt, the scroll bar will disappear or become faded. Faded scrollbar is when alt is held for a very short period of time, so the application switcher menu only shows up for ~0.1 sec.

Using static application switcher in compiz.

Window's shadow border also sometimes longer to appear if alt is held, but it doesn't seem consistent or related to scrollbar.

The 'invisible' part is an overlay that's the same colour as the background. If scrolling up or down, when the line representing the current location moves past the 'invisible' part, it's erased, so that if the line representing the visible portion is returned to that area, the 'invisible' part is smaller.

Nautilus, gedit, and gnome-terminal all seem to be affected by this bug. The line isn't totally invisible, but being able to see it could depend on having an LCD screen that provides high contrast near the white range at that viewing angle. All three of these applications are demonstrating the bug for me right now, but I'm not sure if they always do.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: compiz 1:0.9.12+14.10.20140918-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 331.113 Mon Dec 1 21:08:13 PST 2014
 GCC version: gcc version 4.9.1 (Ubuntu 4.9.1-16ubuntu6)
.tmp.unity.support.test.0:

ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,imgpng,regex,gnomecompat,place,move,vpswitch,mousepoll,obs,wall,animation,shift,snap,resize,expo,session,ezoom,workarounds,staticswitcher,fade]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Apr 14 03:45:07 2015
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.16.0-30-generic, x86_64: installed
 nvidia-331, 331.113, 3.16.0-30-generic, x86_64: installed
 nvidia-331-uvm, 331.113, 3.16.0-30-generic, x86_64: installed
GraphicsCard:
 NVIDIA Corporation G96M [GeForce 9650M GT] [10de:064c] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:1912]
MachineType: ASUSTeK Computer Inc. N50Vn
PackageArchitecture: all
ProcKernelCmdLine: root=UUID=b09dc720-93ec-4fdf-a42f-7ea19a9af555 ro quiet splash
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/05/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 211
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N50Vn
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr211:bd03/05/2009:svnASUSTeKComputerInc.:pnN50Vn:pvr1.0:rvnASUSTeKComputerInc.:rnN50Vn:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: N50Vn
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Mon Apr 13 00:44:08 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.errors: Error loading keymap /var/lib/xkb/server-09D1F3CDBE4F6C8C6E82A68933E164F92A33A272.xkm
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.16.0-1ubuntu1.3