Paulo Sanches, baixei sua versao do acbrnfemonitor e realmente aceitou o comando como fazia anteriormente, só que deu este erro, estou em ambiente de homologação será que é por isso ?
NFe.CancelarNFE("31130407720498000106550010000034031000034031","ISSO E APENAS UM TESTE")
OK: Lote de Evento Processado.
[CANCELAMENTO]
Versao=13_0_74
TpAmb=2
VerAplic=13_0_74
CStat=578
XMotivo=Rejeicao: A data do evento nao pode ser maior que a data do processamento
CUF=31
ChNFe=31130407720498000106550010000034031000034031
DhRecbto=05/04/2013 19:17:37
NProt=
tpEvento=110111
xEvento=CANCELAMENTO
nSeqEvento=1
CNPJDest=
emailDest=
XML=<?xml version="1.0" encoding="UTF-8" ?>
<procEventoNFe versao="1.00" xmlns="http://www.portalfiscal.inf.br/nfe">
<evento versao="1.00">
<infEvento Id="ID1101113113040772049800010655001000003403100003403101"><cOrgao>31</cOrgao><tpAmb>2</tpAmb><CNPJ>07720498000106</CNPJ><chNFe>31130407720498000106550010000034031000034031</chNFe><dhEvento>2013-04-05T19:17:55-03:00</dhEvento><tpEvento>110111</tpEvento><nSeqEvento>1</nSeqEvento><verEvento>1.00</verEvento><detEvento versao="1.00"><descEvento>Cancelamento</descEvento><nProt>131130033482032</nProt><xJust>ISSO E APENAS UM TESTE</xJust></detEvento>
</infEvento>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/><Reference URI="#ID1101113113040772049800010655001000003403100003403101"><Transforms><Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><DigestValue>F6N+trXD1GENtxUweh1721WaL9k=</DigestValue></Reference>
</SignedInfo>
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</SignatureValue>
<KeyInfo><X509Data><X509Certificate>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</X509Certificate></X509Data>
</KeyInfo>
</Signature>
</evento>
<retEvento versao="1.00">
<infEvento><tpAmb>2</tpAmb><verAplic>13_0_74</verAplic><cOrgao>31</cOrgao><cStat>578</cStat><xMotivo>Rejeicao: A data do evento nao pode ser maior que a data do processamento</xMotivo><chNFe>31130407720498000106550010000034031000034031</chNFe><tpEvento>110111</tpEvento><xEvento>CANCELAMENTO</xEvento><nSeqEvento>1</nSeqEvento><dhRegEvento>2013-04-05T19:17:37-03:00</dhRegEvento>
</infEvento>
</retEvento>
</procEventoNFe>