Thanks for the detailed report!
According to your log, this happens when trying to perform any API request:
Code:
{"stat":"fail","code":98,"message":"Login Failed"}
Are you using a flickr.com account in JDownloader?
If yes: What happens if you go to Settings -> Account Manager -> Rightclick on your flickr account -> Refresh --> Is JD able to successfully check your flickr account and does the crawler work fine now?
If it still doesn't work: Remove your flickr.com account from JDlownloader and try again.
Not not:
I have no idea why it fails for you.
It's working fine here with- and without flickr account and with all of your given example URLs so I'm unable to reproduce your issue.