Having a similar issue that has been brought up before.

http://forum.form2content.com/bug-on-the-content-type-image-links-tab

I'm running Form2Content Pro 6.16.0 and Joomla 3.7.5 Stable.

Whenever I try to change any value on the Images and Links tab they are not saved and revert to default.

I tracked down the MySQL statement that seemingly would be the UPDATE call for this saving routine and couldn't see anywhere in here where it even tried to update any of these fields:

35345 Query UPDATE `j16_f2c_project` SET `title`='News Article',`created_by`='62',`created`='2011-09-15 19:59:53',`modified`='2017-09-19 15:03:40',`version`='3.1.0',`published`='1',`settings`='{\"article_caption\":\"News Article\",\"id_front_end\":\"0\",\"id_caption\":\"\",\"title_front_end\":\"1\",\"title_caption\":\"\",\"title_default\":\"\",\"title_attributes\":\"\",\"title_alias_front_end\":\"0\",\"title_alias_caption\":\"\",\"metadesc_front_end\":\"0\",\"metadesc_caption\":\"\",\"metakey_front_end\":\"0\",\"metakey_caption\":\"\",\"frontend_catsel\":\"1\",\"category_caption\":\"\",\"catid\":\"8\",\"cat_behaviour\":\"1\",\"cat_joomla_acl\":\"0\",\"author_front_end\":\"0\",\"author_caption\":\"\",\"author_alias_front_end\":\"0\",\"author_alias_caption\":\"\",\"access_level_front_end\":\"0\",\"access_level_caption\":\"\",\"access_default\":\"1\",\"frontend_templsel\":\"0\",\"intro_template\":\"news_article_intro.tpl\",\"intro_template_caption\":\"\",\"main_template\":\"news_article_main.tpl\",\"main_template_caption\":\"\",\"date_created_front_end\":\"1\",\"created_caption\":\"\",\"frontend_pubsel\":\"1\",\"publish_up_caption\":\"\",\"publish_down_caption\":\"\",\"state_front_end\":\"1\",\"state_caption\":\"\",\"state_default\":\"0\",\"featured_front_end\":\"0\",\"featured_caption\":\"\",\"featured_default\":\"0\",\"language_front_end\":\"0\",\"language_caption\":\"\",\"language_default\":\"*\",\"max_forms\":\"\",\"captcha_front_end\":\"0\",\"required_field_text\":\"*\",\"create_joomla_article\":\"1\",\"use_form_template\":\"0\",\"form_template\":\"\",\"tags_front_end\":\"1\",\"tags_caption\":\"\",\"tag_field_ajax_mode\":\"1\",\"tags_allow_custom\":\"1\",\"associations_front_end\":\"0\",\"associations_caption\":\"\"}',`attribs`='{\"show_title\":\"\",\"link_titles\":\"\",\"show_tags\":\"\",\"show_intro\":\"\",\"show_category\":\"\",\"link_category\":\"\",\"show_parent_category\":\"\",\"link_parent_category\":\"\",\"show_author\":\"\",\"link_author\":\"\",\"show_create_date\":\"\",\"show_modify_date\":\"\",\"show_publish_date\":\"\",\"show_item_navigation\":\"\",\"show_icons\":\"\",\"show_print_icon\":\"\",\"show_email_icon\":\"\",\"show_vote\":\"\",\"show_hits\":\"\",\"show_noauth\":\"\",\"alternative_readmore\":\"\",\"article_layout\":\"\"}',`metadata`='{\"robots\":\"\",\"author\":\"\",\"rights\":\"\",\"xreference\":\"\"}',`metakey`='',`metadesc`='' WHERE `id` = '8'


Any help would be appreciated. Thanks so much!