Also had problem importing my list through mac with numbers when saved in csv or excel format. Even when my boyfriend who has excel on his pc was saving in csv through his computer it didn't worked. WHAT WORKED was importing my list to google sheet and saving a csv file from there. No problem, even if the title automatically generated had spaces and hyphen. Hope that can help some of you guys.
Same thing here. LOSING A LOT OF TIME!!!! And the problem exists since years now. Hope to see a positive outcome to this soon.