I just tried and failed with my Windows phone.  Did not even see a captcha field,  just got a message saying username/password invalid.

No, brm you are not alone. The captcha image doesn't show properly anymore when opening with windows phone   at least with default browser or UCbrowser I use. But with app that lets me choose the browsers user agent Id, I can load it in desktop mode which isn't even responsive to screen size and there the image shows properly.
The mobile 'app' style version is unfortunately for iPhone and android only and there ain't captcha at all.

Hope they fix it soon. (maybe I should go look for some support mail address to report it...)

Sent from my RM-825_eu_finland_422 using Tapatalk

Capcha is so annoying !!! Please get rid of it !

I got the captcha back!
Mailed shutter stock but they couldn't replicate the issue.
Then tried changing the settings a bit and with IE just changing Website preference from mobile to desktop brought the image back.
Mysteriously same didn't work for the UCbrowser which has same setting.

Lets keep our windows phones a while longer.

Sent from my RM-825_eu_finland_422 using Tapatalk

Thanks, changing to desktop worked for me also.