Attributes keeps loading / Unable to edit variable product

I had everything working fine since months. Today I wanted to edit my Variable product and as soon I’m getting into the Variations tab, the variations names are loaded but the “wheel” keeps running and I can’t expand/edit anything.

I tried to disabled plugins without success.

Here is more info about my environment:
### WordPress Environment ###
WC Version: 3.0.4
Log Directory Writable: ?
WP Version: 4.7.4
WP Multisite: –
WP Memory Limit: 768 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.30
PHP Post Max Size: 128 MB
PHP Time Limit: 300
PHP Max Input Vars: 3000
cURL Version: 7.53.0
OpenSSL/1.0.2k

SUHOSIN Installed: –
MySQL Version: 5.6.28
Max Upload Size: 128 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.0.4
WC Database Prefix: wp7i_
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Security ###

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

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Thanks,