Do you have both KB2982791 and KB2993651 installed?
You can check by running the following commands at an elevated command prompt:
dism /online /get-packages | find "KB2982791"
dism /online /get-packages | find "KB2993651"
If KB2982791 is installed you should see the following output from running the above command:
Package Identity : Package_for_KB2982791~31bf3856ad364e35~amd64~~6.1.1.1
If KB2993651 is installed you should see the following output from running the above command:
Package Identity : Package_for_KB2993651~31bf3856ad364e35~amd64~~6.1.1.3
No to the first (which you may recall was a botched update.) Yes to the second, which was the fix.
See http://support.microsoft.com/kb/2982791
which says:
Microsoft is investigating behavior in which fonts do not render correctly after any of the following updates are installed:
2982791
(http://support.microsoft.com/kb/2982791/ )
MS14-045: Description of the security update for kernel-mode drivers: August 12, 2014
2970228
(http://support.microsoft.com/kb/2970228/ )
Update to support the new currency symbol for the Russian ruble in Windows
2975719
(http://support.microsoft.com/kb/2975719/ )
August 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
2975331
(http://support.microsoft.com/kb/2975331/ )
August 2014 update rollup for Windows RT, Windows 8, and Windows Server 2012
Status
KB 2993651
(http://support.microsoft.com/kb/2993651/[EN]/ )
replaces this security update and resolves this known issue.