Syncing a PDA with OPSSQL can sometimes return an error "Path/File Access Error". This error is related to to the File permissions. You will need to be sure to have full control set for any user that plans to sync a PDA for the OPSSQL folder on your system.

To do this:

Browse to your OPSSQL installation directory (Default is C:/OPSSQL).

Right click on any white space in this folder and select properties.

There should be a securities tab. Here you can set permisions for any of your users. Any user that will be syncing needs to have read and write privledges or full control.