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ITunes will only display special characters/foreign languages when it is started while not connected to the internet

Update:10-11Source: network consolidation
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This problem started right after upgrading to iTunes 10.5.
I opened iTunes and all of the songs with special characters, japanese text, etc. showed up as boxes (the fallback unicode rectangle or whatever the proper name is). The result is that I have a ton of songs that just look like this - [][][][][][][][]
The only thing I have found to fix it is if I disconnect the internet, restart the computer, open itunes and then I can reconnect the internet. When I open itunes while not online, the song titles all go back to normal.
I can't figure out why being online makes any difference. Yes, I have the correct language packs installed and the characters display correctly in all programs besides itunes.
Thanks for any help. Let me know if there is any additional info you need.

The Best Answer

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I don't have the bit-rot or router issue, but I'm frequently experiencing dropped connections with my ISP (a satellite service). Disabling / reabling the Ethernet port, or closing my laptop lid for a few seconds, usually fixes the problem, abiet temporarily.
I've noticed during these dropped connections that over 90% of the time, the ethernet port continues to show as active and with a valid IP. The problem seems to have something to do with OS X requesting a new IP when it already has one. The longer I'm online, the more frequently this happens.
I've installed Apples Broadband Tuner, and am going through my providers Web proxy.
However, when I VPN into work with the companies PC laptop, the connection seldom drops and is likely due to VPN server overload, which leads me to believe this is an OS X thing.
Thanks for your help.
BTW, I removed my router because, even though the setting were correct and both laptops where getting an IP, the MAC dropped more frequently, and I had a much harder time getting a VPN connection on the PC.