No, it's not my monitor having a dark spot, there's really a strange blotch on the progress page if you view your downloads. Here is a screenshot:

Look to the immediate right of "0 bytes/CURRENT" and you should see what I mean. The problem is easily reproducible by simply opening the "my downloads" screen, and has been consistent for a while (I even tried reinstalling Steam to see if that would fix it)

Unless the spot is highly intentional, it seems like a graphical glitch to me. I haven't noticed it before in the Steam client, and it just looks so out of place...

Here is my technical and hardware info, in case that helps:

Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x3a
    CPU Stepping:  0x9
    CPU Type:  0x0
    Speed:  2501 Mhz
    4 logical processors
    2 physical processors
    HyperThreading:  Supported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 12.04.4 LTS (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.5.0-48-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11300000
    X Window Manager:  Compiz
    Steam Runtime Version:  steam-runtime-release_2014-02-05

Video Card:
    Driver:  Intel Open Source Technology Center Mesa DRI Intel(R) Ivybridge Mobile x86/MMX/SSE2

    Driver Version:  3.0 Mesa 9.0.3
    OpenGL Version: 3.0
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 59 Hz
    VendorID:  0x8086
    DeviceID:  0x166
    Number of Monitors:  2
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1600 x 900
    Desktop Resolution: 2624 x 900
    Primary Display Size: 15.04" x 8.46"  (17.24" diag)
                                            38.2cm x 21.5cm  (43.8cm diag)
    Primary VRAM Not Detected

Sound card:
    Audio device: Intel PantherPoint HDMI

Memory:
    RAM:  5836 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  274107 Mb
    Largest Free Hard Disk Block:  246726 Mb

Installed software:

Recent Failure Reports: