Actually my theme update didn’t fix – turns out (if i understand correctly) The plugin update included grabbing some info from the footer – which I was purposefully not loading on my page – i activated the footer on my page and bam- there was my date picker. So i just had to change how i displayed my custom page.
Sorry – I know nothing about how to track down conflicts ??
What theme are you using and can you try changing that page to a different page template within your theme to narrow down (this helped me too)?
i did donate to the developer to get some “premium support” input and he explained my previous assumption was incorrect (date was supposed to be text – and when i changed it to date – it was forcing the browser picker to appear not the plugin picker) – shows how little I know. He was the one who suggested switching themes to see.