Hi Nuno

i faced some problems your already facing and succeeded to solve them so i'd like to as you

did you install SERweb tables ?

if though the problems come from there especially the phplib_id field a duplication happened between it and the "id" filed so you have to remove SERweb tables and all thing will go smoothly without any errors

p.s i recommend you to remove the whole database e.g openser and install it again using openser_mysql.sh script

e.g /path/to/openser_mysql.sh create

press yes for presence and that stuff but for SERweb no

try and tell me what you get

BR

Muhammad