Extended H1B go abroad?

My H1B renewal(7th yr) is pending for over 4 months! whoever knows the possible reason would be highly appreciated?
And if the renewal is proved, can I go abroad and apply new visa stampt in US consulor? I heard the renewal visa is only valid during your stay in US, can't go abroad....
Xiao Bai Tu? DaXiaMen??? Please help!
Thanks in advance

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