Hi,
Changing collation on whole table in table properties never worked for me, but today I found that
HeidiSQL generates this SQL
ALTER TABLE web_users
COLLATE='utf8_czech_ci', CONVERT TO CHARSET utf8;
while working command would be
ALTER TABLE web_users_session
CONVERT TO CHARACTER SET utf8 COLLATE utf8_czech_ci;
If possible, please confirm this and fix would be nice.
I am using 9.3.0.5119 right now on Mysql 5.6.17.