Hi, i had the same problem but could not receive help from the support team. They sended me a ftp link with a id and pass , and They are refused from the ftp.....so what to do , you can also try to phone but like me you will have an answer robot.
I have the problem too when i try to add one item to a bill.... the software ejects me out.
I can not make a bill now..!! 
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I don't know if the compatibility isn't correct by apple or by NCH?.