"ji" is pronounced "tji" and "qi" more like "chi" right? But in "duibuqi" it sounds like the "qi"-part is pronounced "tji" as well. Am I right and in case I am, how do I know when it's pronounced "tji" or "chi"?

Ni hao! Thank you for your post! You are right - ji is pronounced like 'tji' and qi is pronounced like 'chi' under all circumstances. The duibuqi you mentioned about should sound like 'duibuchi' too. I It may be that the audio is unclear. I will let our Development team know and we can review that if necessary. :) Lin

I can get vocab when I click on thew Chinese word in the course meterial. Also when I open "vocabulary" I cannot hear the pronunciation of the Chinese word that I click on. What is the correct way to hear these new or added words?

Sorry - I mean I cannot get the icon of "vocab" to come up when I click on the Chinese word to learn & hear it

Hi Lea, Thank you for your post. I'm sorry for the delay. We sometimes make improvements/changes to My Vocab which can mean it's down for a little while. Have you tried saving a word recently? It may be that when you tried last time we were making an update. If you are still having trouble, please email our support team at [email protected]. Best of luck for your Chinese learning! :)