Sorry to drag up an old thread, we have the same issue.
We are using Safari on iOS 8.3 on iPad Air. Running Adaxes 2014.1 (3.7.11218.0).
The PssEnroll.aspx page allows you to type in a question but the drop down does not work. For testing I tried turning off user-defined questions which only disabled typing in the question box and drop down still did not work.
The useragent string of Safari is "Mozilla/5.0 (iPad; CPU OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F69 Safari/600.1.4".
Just in case I also tried the fix in OSX Yosemite which didn't work.
Cheers.