I've created more than 200 bundled products and it worked always as expected. But suddenly, the bundle items tab to add the bundle options is showing a blank page. I have absolutely no idea why this happened. I cleared cache but without results. When opening an existing bundle product, it shows the bundle options. Creating a new one doesn't.
The ajax content that is loading when clicking "Bundle items" is referring to https://www.mywebsite.com/index.php/admin/admin/bundle_product_edit/form/id/15064/ and I get a ERR_EMPTY_RESPONSE. Existing bundle products have the same url, other ID and getting response. I copied the website local and there this is working. So something with folder permissions, server setup, routing?