I am absolutely delighted to help you and am thankful of the progress made.
What I understand is as follows:
Bridge exists for one simple reason only, it's to allow Logic, when running in 64 bit mode (64 bit is good, it means your apps can use more than 4GB of RAM!) to be able to continue working with 32 bit only versions of plugins. Normally apps can't do this, it's 32 or 64 bit only for everything the app clings on to so it's, as far as I can tell, a little bit of magic that binds it together.
I know that you can force an app to work in 32 bit mode but that will restrict the app to a 4GB RAM ceiling. Here is how you can do that. I will use Safari's info window as an example. I went to the Applications window, clicked once on Safari and then performed a command-I from the keyboard, this window opens. Notice that below the colored labels you can choose to open an application in 32 bit mode. This is useful if, in the case of Safari, I needed a certain resource that Safari uses to work, useful if the resource is 32 bit but Safari is running in 64 bit mode without the tick turned on.
You can find related information here:
http://support.apple.com/kb/TS3171
http://support.apple.com/kb/HT3773
Incidently I found this sourced from http://support.apple.com/kb/HT3989?viewlocale=en_US&locale=en_US. It's visible after revelaing the first question. Jsut do the opposite to run in 32 bit mode. Bridge will never need to open because Bridge is there to permit 32 bit plugins to operate in Logic when it launches in 64 bit mode.
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I will remind of this link which provides a wealth of Logic specific info, http://support.apple.com/kb/HT3989?viewlocale=en_US&locale=en_US
I took a caption of this FAQ which I believe is relevant
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Can I use my existing Audio Unit (AU) plug-ins in 64-bit mode?
To make the transition to 64-bit easier, both Logic Pro and MainStage are still able to access 32-bit-only Audio Unit plug-ins while in 64-bit mode by using a utility application called 32-bit Audio Unit Bridge. This application opens automatically whenever a 32-bit-only Audio Unit plug-in is accessed.* The 32-bit Audio Unit Bridge hosts all currently used 32-bit-only Audio Unit plug-ins and runs alongside Logic Pro or MainStage to provide access to the plug-ins being used.
* While most 32-bit plug-ins should work with the 32-bit Audio Unit Bridge solution, not all plug-ins may be compatible.
- Under the circumstances, I would contact the plugin vendor directly, asking them if they are aware of any specific known issue that might prevent the plugin you want to use with your software/hardware configuration.
Something that might help them — if you can add an attachment when emailing them you can actually save the "System Information" as a file and send it to them. This will let them see exactly what is installed on your mac and will provide them all the knowledge on your currently active hardware.
To do this:
1) Click to the Apple Menu
2) Click on "About this mac"
3) Click on "More Info"
4) Click "system Report"
5) Click on the "File" menu and choose "Save…"
6) Save it to your desktop and attach it in an email to them noting that everything about your system can be viewed on a mac by double clicking the attached file. It can only be viewed on a mac.
If you can't attacha file, let them know the version of Mac OS X, the version of their plugin and the version of Logic.
Finally, it sounds like things are working again but now you don't have access to the plugin, not sure you need the plugin though, if not you are good to go!
Hope this helps.
Don't hesitate to chime back