This looks like a video driver issue, try to update it.

>This is weird...
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>I see the code of Message #1558441 fine, but if I leave it in the screen for about 5 seconds, a text would appear in between some lines of code and remain there until I try to snag it (I used PrtScn to capture) (probably the trigger is not snagit but losing focus)
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>The first image shows the message right after selecting it, the second image shows the message 5 seconds later, this only happens with this particular message.
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>(Using FireFox)