We had same problem, but i think that i've found solution
Try to find this file and delete it:
/Users/<home folder>/Library/Preferences/Adobe InDesign/Version 7.0/<language code>/PlugInConfig.txt
If you are using version ID CS5.5, than maybe you need to look in different folder (Version 7.5?) - we are using ID CS5.
Please, let me know, if this helps - we solved our problem after removal of this file.
P.S. - Oh, you are Adobe Emplyee. If this will help, it will make whole situation even more funny for me.
You are a genius! And I've had a lapse in brain power. I can't believe I didn't try removing the preferences folder at some point in my attempts to resolve this myself. It's one of the most basic Technical Support product troubleshooting methods. I've got a KB doc started about this, which I'll be updating shortly and making public.
I have a theory about how the exact nature of the failure, which I'll get confirmation of and outline in the KB doc.
Matthew, I deleted the suggested file, but I still get the same message inside Indesign: "You do not have a compatible Digital Publishing Plug-in. Click here to download the Folio Producer tools"
I've tried rebooting my Mac, relaunching InDesign 5.5, and re-installing the update multiple times. Any other suggestions?
The "Get Update" button (and probably every other supposed-to-be helpful referral in the Folio Builder) starts to install a useless update. Go to this page instead and choose specifically the "Update Folio Builder" (for CS5 or CS 5.5) somwhere halfway on the page. This should work. Does it ?
I found out how to solve the problem....
Download and install Folio and Builder extensions
Go to Adobe Extension Manager
Click on Indesign CS5 or 5.5
Then click on File -> Install Extension
Search-> C:\ProgramData\Adobe\InDesign\Version 7.0\en_GB\Extensions
For some reason the Digital Plug-in is installed in the en_GB folder (German)
Click -> Open
Then fallow the Installation, it should install it for you!
Thanks for the quick response, but that didn't help any. The path stated,
Mac CS5.5: /Users/<username>/Library/Preferences/Adobe InDesign/Version 7.5/<language_locale> doesn't exist in Mountain Lion.
So apparently my issue is that I can't find where my InDesign Preference files are now kept in Mountain Lion, any thoughts on that?