Plugins do not work after migrating site online

Hello, all my plugins do not work, after I have migrated my site online from a local server using MAMP.
I have exported my MySQL Database both with PHPMyAdmin and changed all the URLs and paths via find and replace from localserver to my domain, and also used the plugin WP Migrate Database, which would supposedly keep plugins working. In both cases most seems to be working fine apart from plugins. Also deactivation/deletion and reinstallation does not help once everything was online. Any ideas what could cause the problem?
Many thanks in advance!