Adjustment brush causes screen to go black momentarily

On a few, but not all images, my screen goes black for about 5 seconds while I am using the adjustment brush in the Develop module.
I am running LR 4.4 on Windows 7, with I7 CPU and 8GB of RAM. No other apps are running; the resource monitor shows I am using very little CPU and about 50% of memory. I have an Intel HD Graphics 3000 card, and a Sony monitor running native resolution at 1920x1080.
I switched to a different image, of the same subject, and started making lots (about 50) adjustments with the brush, and I did not have any issues. I also exported the 2 images to a new catalog (to make sure I wasn't having a problem with my catalog being too large) and had the same experience.
Has anyone had this experience? Any solutions?
Thanks in advance for your feedback.

Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://hacks.mozilla.org/2010/09/hardware-acceleration/
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 21.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will lose all personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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Adjustment brush causes screen to go black momentarily

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