I have check the MySQL data directory and look for the permissions of the databases created through siteworks.I found that the database is having SUID set for group and the secondary group is the account name instead of MySQL .
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[root@server ~]# ls -ld /var/lib/mysql/user_test
rwx–S— 2 mysql user 4096 Oct 2 06:42 /var/lib/mysql/user_test
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PS : I am able to install wordpress successfully to the database which I have created manually.The issue arises only when databases are created through siteworx.
I believe your particular issue relates to quotas and limits.
As I’m not sure which distro your using or versions, of if it’s a vps I cannot help sorry, but you do need to check your quotas and limits which maybe imposed.