Since I have experienced some cases when I do an online play, Windows Firewall would prompt me if I should Unblock the program and add it to the exception list.
It MIGHT be that your firewall is causing this. Add ygopro_vs.exe to the exception lists of your firewall or any anti virus you have.
Also, try running as administrator and see if that helps.
Edited by user
2014-04-13T16:10:16Z
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Reason: Added suggestion.
Call me Blanc if you are referring to me in this forum.