Issue #1775 has been updated by Martin D端rst.

Status changed from Open to Closed

Switching off on-access virus checks for disk writes (still keeping them for disk reads) with MacAffee solved this problem. Thanks everybody for their help, in particular neomjp neomjp.
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http://redmine.ruby-lang.org/issues/show/1775

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http://redmine.ruby-lang.org