Automatic E-Mail not sent on completed order [after update]

Hello Support,

so I guess after the last upadate (to 3.5.1) the automatic e-mail after a completed payment process stopped working. Right now the customer does not get an email notification with the invoice and the order information (incl. download link to downloadable products).

Even though I am not sure, I assume that the last update broke that function, since it was still working around one week ago.

WooCommerce -> Settings -> Emails: Every setting except “Customer invoice / Order details” is “checked”. Only “Customer invoice / Order details” shows a grey right sided arrow. In contrast to the other options “Customer invoice / Order details” does not show me a checkbox to activate that function.

How do I enable that function again?

With best regards
ruphusroger

### WordPress Environment ###

Home URL: https://www.gunbot-settings.com
Site URL: https://www.gunbot-settings.com
WC Version: 3.5.1
Log Directory Writable: ?
WP Version: 4.9.8
WP Multisite: –
WP Memory Limit: 1 GB
WP Debug Mode: –
WP Cron: ?
Language: en_US
External object cache: –

### Server Environment ###

Server Info: Apache
PHP Version: 7.0.32 - We recommend using PHP version 7.2 or above for greater performance and security. How to update your PHP version
PHP Post Max Size: 256 MB
PHP Time Limit: 300
PHP Max Input Vars: 5000
cURL Version: 7.60.0
OpenSSL/1.0.2k

SUHOSIN Installed: –
MySQL Version: 5.7.24
Max Upload Size: 256 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.5.1
WC Database Prefix: wpgs_
Total Database Size: 13.01MB
Database Data Size: 9.22MB
Database Index Size: 3.79MB
wpgs_woocommerce_sessions: Data: 0.84MB + Index: 0.05MB
wpgs_woocommerce_api_keys: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_attribute_taxonomies: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_downloadable_product_permissions: Data: 0.01MB + Index: 0.01MB
wpgs_woocommerce_order_items: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_order_itemmeta: Data: 0.03MB + Index: 0.02MB
wpgs_woocommerce_tax_rates: Data: 0.01MB + Index: 0.01MB
wpgs_woocommerce_tax_rate_locations: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_shipping_zones: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_shipping_zone_locations: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_shipping_zone_methods: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_payment_tokens: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_payment_tokenmeta: Data: 0.00MB + Index: 0.00MB
wpgs_woocommerce_log: Data: 0.00MB + Index: 0.00MB
wpgs_cfs_contacts: Data: 0.00MB + Index: 0.00MB
wpgs_cfs_countries: Data: 0.01MB + Index: 0.00MB
wpgs_cfs_forms: Data: 0.13MB + Index: 0.00MB
wpgs_cfs_membership_presets: Data: 0.00MB + Index: 0.00MB
wpgs_cfs_statistics: Data: 0.00MB + Index: 0.00MB
wpgs_commentmeta: Data: 0.00MB + Index: 0.00MB
wpgs_comments: Data: 0.01MB + Index: 0.01MB
wpgs_failed_jobs: Data: 0.00MB + Index: 0.00MB
wpgs_links: Data: 0.00MB + Index: 0.00MB
wpgs_mailchimp_carts: Data: 0.00MB + Index: 0.00MB
wpgs_options: Data: 0.96MB + Index: 0.07MB
wpgs_postmeta: Data: 6.05MB + Index: 2.76MB
wpgs_posts: Data: 0.70MB + Index: 0.19MB
wpgs_queue: Data: 0.00MB + Index: 0.00MB
wpgs_termmeta: Data: 0.01MB + Index: 0.02MB
wpgs_terms: Data: 0.00MB + Index: 0.02MB
wpgs_term_relationships: Data: 0.26MB + Index: 0.58MB
wpgs_term_taxonomy: Data: 0.01MB + Index: 0.01MB
wpgs_UPCP_Catalogues: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Catalogue_Items: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Categories: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Custom_Fields: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Fields_Meta: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Items: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Item_Images: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_SubCategories: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Tagged_Items: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Tags: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Tag_Groups: Data: 0.00MB + Index: 0.00MB
wpgs_UPCP_Videos: Data: 0.00MB + Index: 0.00MB
wpgs_usermeta: Data: 0.19MB + Index: 0.02MB
wpgs_users: Data: 0.00MB + Index: 0.01MB
wpgs_wc_download_log: Data: 0.00MB + Index: 0.01MB
wpgs_wc_webhooks: Data: 0.00MB + Index: 0.00MB
wpgs_wpgdprc_consents: Data: 0.00MB + Index: 0.00MB

### Post Type Counts ###

attachment: 187
customize_changeset: 23
nav_menu_item: 16
page: 14
post: 2
product: 283
revision: 62
shop_coupon: 4
shop_order: 22
wpcf7_contact_form: 1

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (10) ###

Contact Form 7: by Takayuki Miyoshi – 5.0.5
GDPR Cookie Consent: by WebToffee – 1.7.0
Enhanced E-commerce for Woocommerce store: by Tatvic – 2.1.4
Mailchimp for WooCommerce: by Mailchimp – 2.1.11 – Not tested with the active version of WooCommerce
MyCryptoCheckout: by edward_plainview – 2.25
Woo Checkout for Digital Goods: by Multidots – 2.3
WooCommerce PayPal Checkout Gateway: by WooCommerce – 1.6.5
Woocommerce Products Per Page: by Jeroen Sormani – 1.2.6 – Not tested with the active version of WooCommerce
WooCommerce: by Automattic – 3.5.1
WP GDPR Compliance: by Van Ons – 1.4.2

### Settings ###

API Enabled: –
Force SSL: –
Currency: USD ($)
Currency Position: right_space
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

### WC Pages ###

Shop base: #5 - /shop/
Cart: #6 - /cart/
Checkout: #7 - /checkout/
My account: #8 - /account/
Terms and conditions: #11 - /terms/

### Theme ###

Name: Storefront
Version: 2.3.5
Author URL: https://woocommerce.com/
Child Theme: ? – If you are modifying WooCommerce on a parent theme that you did not build personally we recommend using a child theme. See: How to create a child theme
WooCommerce Support: ?

### Templates ###

Overrides: –

The page I need help with: [log in to see the link]