Hi AML,
Can you start by checking whether it works here:
http://player.kaltura.com/modules/KalturaSupport/tests/HLSPlaybackTester.html
?
Also see: http://player.kaltura.com/docs/api
in particular http://player.kaltura.com/docs/api#Kaltura.UseAppleAdaptive
Might also help if you provide links the an embedded player so we can take a look.