Oke, I found in the forum the following solution: go back to the former working version of phpmyadmin by changing the reference in the wamp\alias\phpmyadmin.conf file: eg. replace 3.1.1 by 2.11.6 (2 times):
Alias /phpmyadmin "....../wamp/apps/phpmyadmin2.11.6/"
# to give access to phpmyadmin from outside
# replace the lines
#
# Order Deny,Allow
# Deny from all
# Allo
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WampServer English