@Primitive: 14072700 is probably mining ok for you because it might be on a different fork or something. Catia also mentioned that behind a router upnp will only work for 1 of the computers, so that might also have something to do with it.
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Accepted block 13064
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Cannot fastforward chain because of missing data: 0000050e541d00f6d9928d4bf8e080da5cfa66767d4502eb40fec8dd6d21cdea 2
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Cannot fastforward chain because of missing data: 00000bb228da2a56202ef57b60f7c403dd9bd683278b8fbdd184c048e869dee4 2
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Hrm
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Getting size for height : 21238
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