Recently Microsoft released a critical security update causing font corruption and blurry text displayed in Notepad++. I always use Notepad++ for editing files which runs on our Windows 2008 Standard RDS Server. Last Saturday everything was just fine with Notepad++. Today I discovered that the files’s text I usually edit in my Notepad++ looked blurry. Because yesterday there were no problems I already suspected that Windows Update was causing the problem. Editing files in Windows Notepad the texts looks fine. So in my case only Notepad++ was affected. Here’s a pic showing blurry text in Notepad++.
Font corruption Windows – uninstall KB3013455
Looking at the Windows Update history in Control Panel I noticed last night ten updates were installed on our Windows 2008 RDS Server. To identify what update causes the Notepad++ font corruption and made the text look blurry I made a selection out of the ten recently installed updates. The first update I thought it might could cause text related problems was KB3029944. Looking at the detailed information about KB3029944 at https://support2.microsoft.com/kb/3029944 I quote:
Vulnerability in Microsoft graphics component could allow information disclosure: February 10, 2015
The words Microsoft graphics component made me think that this update might be causing the text look so blurry. So after uninstalling KB3029944 and rebooting the Server I got disappointed finding out the text still looked blurry in Notepad++. KB3029944 was not causing problems.
The next security update that was striking my mind was KB3013455. Looking at the MS security bulletin MS15-010 – https://technet.microsoft.com/library/security/MS15-010 I quote:
validates data returned from user mode functions before being executed, handles TrueType Font error checking, and checks font widths prior to loading fonts into memory.
The words TrueType Font error checking made me think this has to be the one causing all the troubles. So again I went to Control Panel – Windows Update – View update history and selected Installed Updates to remove an update.
After removing update KB3013455 I had to reboot the Server again. As soon as the Server came up I opened Notepad++ to see if there were any changes. I was relieved to find out the font corruption problem was gone. No more blurry text in Notepad++. Problem solved! My Notepad++ files are looking normal again:
Now in order to prevent the font corruption to appear again I had to hide update KB3013455. So I went back to Control Panel – Windows Update and pressed Check for Updates. After this I pointed my mouse to KB3013455 and hit the right mouse button in order to select Hide update.
Note that this is only a temporary solution to fix the blurry text font corruption issue in Notepad++. KB3013455 is an important security update and needs to be installed on your system in order to prevent security issue’s. I will monitor this issue and wait till next security patch day and see if MS releases a new update.
If you also experience problems after update KB3013455 please share your story.
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