We really appreciated that Eric offered a feedback and helped us refine the plugin.
The issue description
Surprise: I was hoping to backup my MainWP site when I discovered that activating MainWP makes the ‘Test and Submit’ button irresponsive in both the FTP ans SFTP remote accounts (no window opening requesting data). Other accounts seems to works.
What is the cause of this issue?
This is caused by the compatibility issue between MainWP and Backup WordPress Site by WPvivid.
The compatibility issue is resolved in version 0.9.12. However, if any user still encounters the issue, please update WPvivid backup plugin to the latest version.