Savvas, I entered your index page, enabled debug mode, here are the errors I get: 

Message:Can't generate URI! Route `shoppro.index` not found!

File:/home/cypyugph/public_html/ow_core/router.php

Line:262

OW Debug - Notice

Message:Declaration of ADSENSE_CMP_DashboardAds::processSettingList() should be compatible with that of BASE_CLASS_Widget::processSettingList()

File:/home/cypyugph/public_html/ow_plugins/adsense/components/dashboard_ads.php

Line:158

OW Debug - Error

Message:Argument 1 passed to adsense_ads_enabled() must be an instance of BASE_EventCollector, instance of BASE_CLASS_EventCollector given

File:/home/cypyugph/public_html/ow_plugins/adsense/init.php

Line:170

OW Debug - Warning

Message:include(/home/cypyugph/public_html/ow_plugins/shoppro/components/index_widget.php) [function.include]: failed to open stream: No such file or directory

File:/home/cypyugph/public_html/ow_core/autoload.php

Line:110

OW Debug - Warning

Message:include() [function.include]: Failed opening '/home/cypyugph/public_html/ow_plugins/shoppro/components/index_widget.php' for inclusion (include_path='.:/opt/alt/php53/usr/share/pear:/opt/alt/php53/usr/share/php')

File:/home/cypyugph/public_html/ow_core/autoload.php

Line:110

OW Debug - Warning

Message:call_user_func() expects parameter 1 to be a valid callback, class 'SHOPPRO_CMP_IndexWidget' not found

File:/home/cypyugph/public_html/ow_system_plugins/base/components/drag_and_drop_panel.php

Line:67

OW Debug - Exception

Message:Class SHOPPRO_CMP_IndexWidget does not exist

File:/home/cypyugph/public_html/ow_system_plugins/base/components/drag_and_drop_item.php

Line:207

Trace:

#0 /home/cypyugph/public_html/ow_system_plugins/base/components/drag_and_drop_item.php(207): ReflectionClass->__construct('SHOPPRO_CMP_Ind...')

#1 /home/cypyugph/public_html/ow_system_plugins/base/components/drag_and_drop_item.php(92): BASE_CMP_DragAndDropItem->checkComponent('SHOPPRO_CMP_Ind...')

#2 /home/cypyugph/public_html/ow_system_plugins/base/components/drag_and_drop_index.php(107): BASE_CMP_DragAndDropItem->setContentComponentClass('SHOPPRO_CMP_Ind...')

#3 /home/cypyugph/public_html/ow_smarty/template_c/f82c98def0c5654cf59eb5687e92e2a54dc1b0f3.file.drag_and_drop_index.html.php(106): BASE_CMP_DragAndDropIndex->tplComponent(Array, Object(Smarty_Internal_Template))

#4 /home/cypyugph/public_html/ow_libraries/smarty3/sysplugins/smarty_internal_templatebase.php(180): content_542e1bb60bd080_22737175(Object(Smarty_Internal_Template))

#5 /home/cypyugph/public_html/ow_core/view_renderer.php(101): Smarty_Internal_TemplateBase->fetch('/home/cypyugph/...')

#6 /home/cypyugph/public_html/ow_core/renderable.php(263): OW_ViewRenderer->renderTemplate('/home/cypyugph/...')

#7 /home/cypyugph/public_html/ow_core/component.php(80): OW_Renderable->render()

#8 /home/cypyugph/public_html/ow_core/renderable.php(250): OW_Component->render()

#9 /home/cypyugph/public_html/ow_system_plugins/base/controllers/component_panel.php(56): OW_Renderable->render()

#10 /home/cypyugph/public_html/ow_core/request_handler.php(271): BASE_CTRL_ComponentPanel->render()

#11 /home/cypyugph/public_html/ow_core/application.php(327): OW_RequestHandler->dispatch()

#12 /home/cypyugph/public_html/index.php(73): OW_Application->handleRequest()

#13 {main}

Type:ReflectionException

All these errors are related to 2 plugins, as you can see, shoppro and adsense, 

I see the update notification for shoppro plugin, you need to update the plugin and see if the error persists, if it is, you'll need to contact plugin developer

And you will need to contact adsense plugin developer too about these errors: 

OW Debug - Notice

Message:Declaration of ADSENSE_CMP_DashboardAds::processSettingList() should be compatible with that of BASE_CLASS_Widget::processSettingList()

File:/home/cypyugph/public_html/ow_plugins/adsense/components/dashboard_ads.php

Line:158

OW Debug - Error

Message:Argument 1 passed to adsense_ads_enabled() must be an instance of BASE_EventCollector, instance of BASE_CLASS_EventCollector given

File:/home/cypyugph/public_html/ow_plugins/adsense/init.php

Line:170

as we do not provide assistance on 3rd party plugins.