Product "custom options" not visible

[phantonym]

Magento 1.9.3.4

I added some custom options to the product:

But the options are not visible in product page. Only description and regular fields are visible:

[Sunil Patel]

Hello @phantonym

please check catalog_product_entity table and check has_options column for that sku

If it is zero then try to change 1 and check it

Hope it will help you

[phantonym]

Thank you for answer.

has_options is already 1 for this row.

[Sunil Patel]

Hello @phantonym

please check with default magento theme like rwd 

if it is work with RWD then it is your theme issue

Hope it will help you.

[phantonym]

Tried rwd theme and other themes. Options are invisible for all themes.

[phantonym]

Anybody have more suggestions?

[Sunil Patel]

Hello @phantonym

try to disable all custom module and try it

[phantonym]

How to do it? There are no existing extensions in Connect Manager.

This Magento was installed and customized by external consultants.

Please tell me detailed steps to show custom options. I have access to file system.