Gnome App "Covers" Screen Problem

I have recently noticed a problem with my Gnome installation. When I start up the machine and log in (I use GDM), If I don't touch the keyboard or mouse after entering my password, the screen will look as if a semi-transparent application starts and covers the entire screen. I run Compiz and have alpha-transparencies blurred. Through the blur I can see the clock in the panel still ticking off the seconds, etc. If I move the mouse, the screen returns to normal. If I wait until the screensaver starts, the screensaver acts normal, and moving the mouse after that results in normal operation as usual.
I have tried to find out what app (or setting) is responsible for this, but have no more ideas. I have tried:
1) Running "top" as soon as I log in, but then (since I have touched the keyboard and/or mouse) the problem never occurs.
2) I have checked for a "hidden" startup app or daemon and can't find anything. I checked both ~/.config/autostart and in the Gnome Startup Apps.
Does anyone have any other ideas about how to find out what app is doing this?
Here is a screenshot of what I see:

What if you run a little script that opens a terminal and runs top automatically at login?

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Problem description:
iMac keeps freezing and returning to login
EtreCheck version: 2.0.11 (98)
Report generated 4 November 2014 2:45:09 pm AEDT
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iMac (27-inch, Late 2013) (Verified)
iMac - model: iMac14,2
1 3.5 GHz Intel Core i7 CPU: 4-core
32 GB RAM Upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
BANK 0/DIMM1
8 GB DDR3 1600 MHz ok
BANK 1/DIMM1
8 GB DDR3 1600 MHz ok
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APPLE SSD SD0128F disk0 : (121.33 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Boot OS X (disk0s3) <not mounted> : 134 MB
Macintosh HD imac27 (disk5) / [Startup]: 3.11 TB (2.84 TB free)
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Core Storage: disk3s2 3.00 TB Online
SAMSUNG HN-M101MBB disk1 : (1 TB)
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EFI (disk1s1) <not mounted> : 210 MB
disk1s2 (disk1s2) <not mounted> : 999.86 GB
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disk2s2 (disk2s2) <not mounted> : 999.86 GB
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