After moving Wordpress, login works, but no admin access anymore

Question

After transferring a wordpress from an old ISP to a new ISP, I have trouble with the admin access / access to the dashboard.

The transfer was done by copying all files

Answer 1

Turns out that this is a bug within Wordpress 4.6.1 when using your own prefix for DB table names.

Rename to wp_ prefix and change the table names and it works.