Just ran in to this issue today...
I'm a new user, and am looking for a forum home. I thought this would be a good site, but today tried to login from my iPhone 6 running 8.1
At first I just couldn't get anything other than a "you need to login to use those functions" kind of email, then I was told that an administrator had removed my posting ability. So I emailed an administrator, and very quickly received helpful replies from Chad at AZ Fishkeeping. I was able to login from an iPad at work... so we quickly realized it wasn't my account, but my phone.
I've got to say, that if I can't login from my phone, I'll probably look elsewhere. Any recent developments figuring this out?