I just re-read your original post and I'm not clear on whether you already disabled the bridge or are attempting to...
In any event, IF you disabled the bridge and can't login because of that reason....this may help you
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How comfortable are you with manipulating database tables? I wouldn't want you to end up with more of a headache than you have now. What I did was on a testing server so if it breaks...no biggie...but if your site is live...well....
Anyway, here's the scenario as I see it....when you bridge CPG and select the Post Based Groups option and go to the Groups menu in the CPG Admin panel it syncs/overwrites the CPG default groups. If your CPG Administrator group had a default value of 1 before and your Forum/CMS has an Administrator group with a default value of 125, then the Administrator group in your CPG database usergroups table will have a value of 125....at least this is what happened on my test site...
When you disable bridging....the link between your admin account and the 'new' administrator group value is broken...since (and this is on my test site)...the administrator group will have the bridge administrator group value and your admin account will have the default CPG administrator group value...
What I did was log in to phpMyAdmin to access my SQL database that Coppermine is set up to use...
Clicked on the cpg140_users table link to activate it...
Clicked the Browse link to see the values...
Noted the user_group for my admin account is equal to 1
Clicked on the cpg140_usergroups table link to activate it...
Clicked the Browse tab to see the values...
Noticed my Administrator group had a group_id value of 125
Clicked the pencil icon next to the Administrators group table entry to access it...
Changed the value group_id value from 125 to 1...
Made sure the Save option was toggled on...
Clicked Go...
Tested the login and Admin access...