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I have seen this problem due to a huge session database table. I would recommend having a look at the database using phpmyadmin, Sequel Pro or similar. Have a look at the {prefix}_session table, if it has 10s of thousands of rows or more then it is likely that your problem is caused by this. First step would be to truncate this table, it is safe to do so. ...


@Eoin If the extensions have been Installed via the normal Joomla process then there should be a manifest file in the /administrator/component/com_customapp that you can start with to rebuild an installation file and do an Export of the SQL Table(s) from the bad environment. Create a fresh install of Joomla somewhere and try installing the rebuilt ...

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