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I think that the AtributeError you see before the program hanging is caused by the python version that's installed by default on Ubuntu Precise (12.04). Apparently the error is related to the threading python library, so it wouldn't be strange that it affects the way the Dynamixel controller manager works.

Are you using 12.04? Would it be a big issue for you to downgrade to a previous version until this is fixed?

Judging by this bug report it seems that the bug has been fixed, but it probably hasn't reached the Ubuntu debs yet.

Can anyone shed more light on this?

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