[[Template core/front/global/widgetArea is throwing an error. This theme may be out of date. Run the support tool in the AdminCP to restore the default theme.]]

Please could you let me know what is showing in your system logs?

Error: Call to undefined method IPS\cms\Records15::canUnfeature() in /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Theme/Theme.php(612) : eval()'d code:2050
Stack trace:
#0 /home/jimiwikm/beta.jimiwikman.se/applications/cms/modules/front/database/record.php(403): IPS\Theme\class_cms_database_display->record()
#1 /home/jimiwikm/beta.jimiwikman.se/system/Dispatcher/Controller.php(139): IPS\cms\modules\front\database\record->manage()
#2 /home/jimiwikm/beta.jimiwikman.se/system/Content/Controller.php(122): IPS\Dispatcher\Controller->execute()
#3 /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Databases/Dispatcher.php(368): IPS\Content\Controller->execute()
#4 /home/jimiwikm/beta.jimiwikman.se/applications/cms/widgets/Database.php(142): IPS\cms\Databases\Dispatcher->run()
#5 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Widget.php(1736): IPS\cms\widgets\Database->render()
#6 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Area.php(904): IPS\Widget::createWidgetFromStoredData()
#7 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Area.php(873): IPS\Widget\Area->getWidgetContent()
#8 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Area.php(881): IPS\Widget\Area->totalVisibleWidgets()
#9 /home/jimiwikm/beta.jimiwikman.se/static/templates/core_front_global.php(23144): IPS\Widget\Area->totalVisibleWidgets()
#10 /home/jimiwikm/beta.jimiwikman.se/system/Theme/SandboxedTemplate.php(68): IPS\Theme\class_core_front_global->widgetArea()
#11 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Area.php(270): IPS\Theme\SandboxedTemplate->__call()
#12 /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Pages/Page.php(2177): IPS\Widget\Area->__toString()
#13 /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Pages/Page.php(2071): IPS\cms\Pages\Page->getPageContent()
#14 /home/jimiwikm/beta.jimiwikman.se/applications/cms/modules/front/pages/page.php(122): IPS\cms\Pages\Page->output()
#15 /home/jimiwikm/beta.jimiwikman.se/applications/cms/modules/front/pages/page.php(49): IPS\cms\modules\front\pages\page->view()
#16 /home/jimiwikm/beta.jimiwikman.se/system/Dispatcher/Controller.php(139): IPS\cms\modules\front\pages\page->manage()
#17 /home/jimiwikm/beta.jimiwikman.se/system/Dispatcher/Dispatcher.php(169): IPS\Dispatcher\Controller->execute()
#18 /home/jimiwikm/beta.jimiwikman.se/index.php(16): IPS\Dispatcher->run()
#19 {main}

Backtrace:

#0 /home/jimiwikm/beta.jimiwikman.se/system/Theme/SandboxedTemplate.php(78): IPS\Log::log()
#1 /home/jimiwikm/beta.jimiwikman.se/system/Widget/Area.php(270): IPS\Theme\SandboxedTemplate->__call()
#2 /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Pages/Page.php(2177): IPS\Widget\Area->__toString()
#3 /home/jimiwikm/beta.jimiwikman.se/applications/cms/sources/Pages/Page.php(2071): IPS\cms\Pages\Page->getPageContent()
#4 /home/jimiwikm/beta.jimiwikman.se/applications/cms/modules/front/pages/page.php(122): IPS\cms\Pages\Page->output()
#5 /home/jimiwikm/beta.jimiwikman.se/applications/cms/modules/front/pages/page.php(49): IPS\cms\modules\front\pages\page->view()
#6 /home/jimiwikm/beta.jimiwikman.se/system/Dispatcher/Controller.php(139): IPS\cms\modules\front\pages\page->manage()
#7 /home/jimiwikm/beta.jimiwikman.se/system/Dispatcher/Dispatcher.php(169): IPS\Dispatcher\Controller->execute()
#8 /home/jimiwikm/beta.jimiwikman.se/index.php(16): IPS\Dispatcher->run()
#9 {main}

You've got an old database template in there. Maybe it was modified and therefore not overwritten? Can you revert to default? 

It seems that for some reason I had a modification in the Display template.

I created a new standard Template and now things work again.

@Esther E. since there seems to be plenty of issues with the Pages Templates, would you suggest that we clean those out before making an upgrade and then recreate them after the upgrade?

Also reset all databases to the default templates I assume is a recommendation before upgrades?