Stopped working an hour or two ago.
Anybody have an idea what is the problem between them ?
If by "Stopped working" means it no longer can be selected from their UI, that is correct but temporary:
What happened to the BTC-e option?
Down, making some quick changes. Should be back up within the hour.
The BitInstant support thread is:
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http://bitcointalk.org/index.php?topic=128314.0