Why does the Windows 7 desktop theme interfere with PDF's showing inside Firefox and how to fix it?

Windows 7
Firefox 28.0
Adobe Acrobat 9 Pro (my default PDF viewer)
I have the browser set to display PDF's: "Use Adobe Acrobat in Firefox." This works fine for a while, then it stops working. I get a white page instead with a pop-up window: "Adobe Acrobat" in the top left corner, a blue question mark in the message field and an OK button on the lower right corner. Clicking the OK button does nothing. Changing the desktop theme image to "Windows 7 Basic" magically cures the problem. After changing the desktop image back to the personalized image, the PDF's will continue showing for a brief period, then they will stop again until resetting the theme to "Windows 7 Basic" again. Can this problem be cured permanently?

Application Basics
Name: Firefox
Version: 28.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Important Modified Preferences
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.smart_size_cached_value: 358400
browser.places.smartBookmarksVersion: 6
browser.sessionstore.upgradeBackup.latestBuildID: 20140314220517
browser.startup.homepage: http://www.yahoo.com/
browser.startup.homepage_override.buildID: 20140314220517
browser.startup.homepage_override.mstone: 28.0
browser.tabs.warnOnClose: false
dom.mozApps.used: true
extensions.lastAppVersion: 28.0
font.internaluseonly.changed: false
gfx.direct3d.last_used_feature_level_idx: 1
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1398447417
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types:
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1398102862
Graphics
Adapter Description: Intel(R) G41 Express Chipset
Adapter Drivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
Adapter RAM: Unknown
Device ID: 0x2e32
Direct2D Enabled: true
DirectWrite Enabled: true (6.2.9200.16492)
Driver Date: 2-11-2011
Driver Version: 8.15.10.2302
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 10
Vendor ID: 0x8086
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) G41 Express Chipset Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: false
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.3
Version in use: 4.10.3
NSS
Expected minimum version: 3.15.5 Basic ECC
Version in use: 3.15.5 Basic ECC
NSSSMIME
Expected minimum version: 3.15.5 Basic ECC
Version in use: 3.15.5 Basic ECC
NSSSSL
Expected minimum version: 3.15.5 Basic ECC
Version in use: 3.15.5 Basic ECC
NSSUTIL
Expected minimum version: 3.15.5
Version in use: 3.15.5

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    ==================
    http://www.projectseven.com/go
    - DW FAQs, Tutorials & Resources
    http://www.dwfaq.com - DW FAQs,
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    "rams30" <[email protected]> wrote in
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    > Hi,
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    >

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