Thank you for the quick response Urs. I have been using your wonderful program on two computers since 2010 so am well acquainted with the nasty access rights and permissions feature of Windows. I'm not saying this problem isn't related to access rights, but it was working before I upgraded to P3DV3. I have double checked permissions, all firewalls are turned off.
The DU accepts the folder address for the data folder but when starting stops at "Connecting DataProvider..." Normally, if there is an access rights issue the program doesn't get this far.
On a side issue, have you thought about support for iPad? I would love to get rid of my noisy second computer.
Thanks for your patience.
Bill