For the first issue please log a case with out technical team: https://qliksupport.force.com/QS_CaseWizard
They will be able to look into the specific users and make recommendations.
For the second issue, are the users seeing your stream? Technically you don't share apps with others, you invited them to your shared stream. So the users who you invited should see a new stream that has your name on it. If this is not the case then please log a case with our technical team.