Z.com for WordPress supports MySQL for its database system where all important data is stored, and “InnoDB” for its storage engine to enable MySQL.
There are several kinds of storage engines that server services provide. So you need to confirm it when you transfer your WordPress website from other service to Z.com for WordPress.
If your database does not use Inno DB tables, not only the performance may be poor but also it causes a problem when saving a data.
So please make sure to change every single table individually using phpMyAdmin after you transffered your data to Z.com for WordPress.