Hello.
It seems that your server is blocking outgoing emails from external mail servers. This could prevent your emails from being sent. You should contact your hosting support and ask them to enable this feature.

Thank you for sharing the solution

Hello.
There should only be a single active template. When you go to the Design > Layouts page, your active theme should already be selected by default. Please verify whether you have multiple stores with the same URL (https://abantecart.atlassian.net/wiki/spaces/AD/pages/8028306/Multi-store).

Have you made any recent changes to your hosting?

Hello.
What is the order status you set in the PayPal module for the Success & captured and Success & not captured?
What is your Transaction Method?

Hello.
Did you see any errors in the AbanteCart error log?

Hello,
It seems that you have debug mode on, which causes a lot of logs to appear. To turn it off, go to Admin → System → Settings → System and change Debug Level: to Level 1 or Level 0. Debug mode should not be On in production.

Then, clear your AbanteCart error log.

Also, please share your AbanteCart error and tell me if this is a fresh installation or an upgrade from an older version.

Hello
Please explain what you are trying to do and what problem you are facing. Also, please send us a screenshot of the issue if possible.

Hello.

Layouts are stored in database https://abantecart.atlassian.net/wiki/spaces/AD/pages/9732104/Manage+Product+Layout
Blocks usually in theme folder like extensions/theme_name/storefront/view/theme_name/template/ directory