The code of the application must have changed recently as historically I have been a user who hasn’t experienced any issues. (Passed Terraform, Vault and CKAD, btw. Thank you!)
Before taking a lab, I am presented with the start lab button. When clicking the start button, nothing happens. Opening up Dev Tools reveals:
Uncaught ReferenceError: mixpanel is not defined
mpTrack https://kodekloud.com/topic/practice-test-imperative-commands-2/:5645
<anonymous> https://kodekloud.com/topic/practice-test-imperative-commands-2/:5743
jQuery 10
<anonymous> https://kodekloud.com/topic/practice-test-imperative-commands-2/:5742
jQuery 10
<anonymous> https://kodekloud.com/wp-content/plugins/kk-learndash-add-on/assets/js/kk-learndash-video-events.js?ver=1627295087:1
3 practice-test-imperative-commands-2:5645:13
mpTrack https://kodekloud.com/topic/practice-test-imperative-commands-2/:5645
<anonymous> https://kodekloud.com/topic/practice-test-imperative-commands-2/:5743
jQuery 10
<anonymous> https://kodekloud.com/topic/practice-test-imperative-commands-2/:5742
jQuery 10
<anonymous> https://kodekloud.com/wp-content/plugins/kk-learndash-add-on/assets/js/kk-learndash-video-events.js?ver=1627295087:1
This problem occurs on all practice exams, not just the imperative command example cited above (sending a stack trace will likely make life easier for your developer 
)
As mixpanel has been associated with aggressive tracking, it has been blocked by either my ad-blockers or DNS sinkhole (pi-hole). I have been running this configuration during my entire time as a KodeKloud subscriber and have only today started experiencing this issue.
My request to you: would you kindly update your code to more gracefully degrade allowing the app to launch without requiring mixpanel or suggest an alternative that still respects my privacy as a paying subscriber?