Not a network guy, so maybe this is a dumb question.

When you say "When I click on the network twisty in the folder view it shows my network drive with a lock icon above it" would this indicate you have no permission to access the dirve, at least from Bridge?

The permisson issues reside primarily with the OS. 

Have you tried starting Bridge by right clicking on icon and choosing "run as administrator"?

If you use select all and then right click you should have option to UNLOCK in flyout menu.  Does this work?

About 2/3 way down fly out menu (open, open with, etc) there is lock item (or unlock item). 

Works for files never had occasion to uise on folders.  Sometimes importing files will result in them all showing locked.

Here is a summary of a former post where user had permission problems when he changed drives.  Might check out his solution and see if it fits.

Hope this works for you also.

1. First make sure that you have Administrator rights on your system via the Control Panel
   
   
2. Next ‘right click’ on the Drive whose files you want to gain full access to, for example the drive that your pictures are stored on, and click on 'Properties'.
   
   
3. Under the Security tab you will see a list of Groups and Users on this drive and the Permissions that they have to do things.
4. Before doing anything to edit these Permissions, first click on the Advanced button. This opens another window with a tab showing the Owner of this drive.
    
   
5. Click on the Owner tab and if you are not already listed as the owner, make yourself the owner by selecting your name from the list. I believe it should appear there if you are an admistrator or user. (In my case at this stage the owner was initially shown as an obscure string of numbers and letters which I believe identified the drive when it was connected to the lap top I was using before I upgraded my machine)
   
   
6. Now be sure to check the box that says "Replace Owner on Subcontainers and Objects" and the click Apply. On completion of this step, the drive in question and all the folders, subfolders and files thereon should now be 'owned' by you. You could check this out by right clicking on a particular folder then clicking Properties > Security > Advanced > Owner. Your name should appear. So far so simples!
   
   
7. Now go back to the Security Tab for your drive (Step 2 / 3 above) and look at the Permissions you currently have. Your aim now is to allow yourself 'Full Control.' If you don’t currently have this level of permission click Edit, select your name on the list, check ‘Full Control’ and 'Apply' the change.
   
   
8. I think I'm right in saying that at this point whilst still working in the Drive directory you are now given the option of ticking boxes which allow you to, in effect, cascade the permission you have just granted yourself to all the files and folders on that drive. Tick the box to allow this and Windows should then take care of the rest.If I'm not quite correct here then in my particular case, for example, all my images were stored on my external drive. The top level, or 'parent' folder in which all my pictures could be found was the 'My Pictures' folder and I had created a number of folders and subfolders ('child ' folders) within that folder. The permissions I gave to the Parent folder – My Pictures – were cascaded down through the Child folders.