Not enough rights to use table 'Signature log' (SIGSignatureLog)

“Not enough rights to use table 'Signature log' (SIGSignatureLog).”

  (Some time this problem is occurred when we want to see record info of any record)

SOLUTION: After installing AX5 SP1, it creates a new configuration key which it leaves unticked. go into Administration > Setup > System > Confiugration and tick the Electronic Signature tick box

good luck!!!!!!