Unable to select profiles when creating online event registration
Found answer from a newer post:


  After more investigation, the problem is solved using the fix from
  agh1 (thanks to him by the way).
  
  It looks like a problem in the civicrm code using jquery.
  
  Here is the url of the fix. We tested it and it works.
  
  https://github.com/civicrm/civicrm-core/pull/10152
  
  I hope this will be in the next civicrm release code.