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08 Sep 2010  
fireberd

Windows 7, 64 bit Home SP1, Win 8.1.1 Pro 64 bit
 
 

Sibelius 4 is the old version, I see Sibelius 6 is now the current version. I would check with Sibelius to see if there are any Windows 7 updates available. It could just be a compatibility issue with Windows 7.
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