Random Block Characters in Safari

For some crazy reason, there are these boxes that are showing up on line breaks within text on a site that I am working on within a co-workers Safari browser version 6.0.3 (8536.28.10) (see attached screen shot)
I've tested this out on my Mac Pro running the same version of Safari and I cannot replicate the issue. So, I am not sure what could be causing this issue. Both Mac's are running up to date versions of Mountain Lion. So far it only seems to be appearing on my co-workers MacBook Pro. The font on the site is using a Google font called Source Sans Pro.

It's probably adware. See The Safe Mac -> Adware Removal Guide.
Good luck,
Clinton

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It (usually) works if you use an English version of Windows. Not if you use a Chinese or Japanese version.

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how do you unblock a blocked plug-ins safari? when i go to the updated version to install it, it still tells me "blocked plug-in".

I'll assume you mean Flash. If you're sure you've installed the latest version of Flash, take each of the following steps that you haven't already tried. After each step, relaunch Safari and test. For a "missing plug-in" error, start with Step 5.
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4. Re-download and reinstall Flash. Download it from this page:
Adobe - Install Adobe Flash Player
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As I can block **** pages in safari or in my imac?

as I can block **** pages in safari or in my imac?

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.... (example)
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Why does my Safari block out content with random blocks of white?

I upgraded my mid-2008 Macbook Pro this week. I went from the last non-unibody model to a Retina MBP 15". I did not move my old computer over, however: I am simply installing apps and moving docs as needed.
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When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
*Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode.
Test while in safe mode. Same problem?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

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Apple Support: Using Apple Hardware Test
http://support.apple.com/kb/ht1509
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