Hi i dont know if this is relevant but the problem sounds similar to one i had at Diamond with Demeter that was covered on the list about six weeks ago. that was with XP hence i am not certain it's relevant. what was missing is the demeter folder for the log file to write to in the %appdata% folder. creating (for each user) a demeter folder in their %appdata% enables the log file to be written and the program to run. for my windows 7 home pc this appears to be uesername/appdata/roaming cheers Fred -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom