I have exactly the same problem - can't access the crossword or puzzles at all on either my iPad or iMac. After ringing the Telegraph's so-called 'helpline" and being told 'it's a Safari problem, either use Chrome or contact Apple' -and then trying with Chrome - fail - I did a bit of research on the Internet. I found a website called standalone.com and there you can download their puzzles app (via Apple's App Store) and register your Telegraph Puzzle subscription details and behold! - you can do the Telegraph crossword on your ipad. Long-winded, but better than nowt, as we say up north. There's supposed to be a facility for printing the crossword, but it misses some of the clues. I've contacted the developers of this App and they're going to iron out this bug ASAP.
Hope that helps a bit?! I'm having to rely on my partner (Windows PC) to print the crossword every day and suffer the usual Windows versus Apple comments.