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How to actually fix the frozen viewport bug:
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Top of screen right click > client > prefs > tick graphics off.
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Relog. 
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Top of screen > client > prefs > click graphics. 
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Close. 
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Open documents > byond > cache > delete all contents
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install http://www.byond.com/download/build/510/510.1347_byond.exe
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Reopen /vg/