Thank you guys for your help. Found a backup plan with the download to computer icon (screen with the arrow down) as you have pointed it out.

I really would gladly help with the site even FOR FREE... because someone has obviously no clue what they are doing...

First, they have disabled/taken down the RESTART button and now there's no VOLUME SLIDER for jam tracks... This is just ridicilous... 

Someone should help them out with the right direction of EVOLUTION of the site because they're going backwards by the look of it...

I have to open two tabs to see notation and be able to control volume of the jam track. Soon I will have to open the 3rd one just to actually press a play button and thr 4th one to stop it...

@RossPRS24 that would work well if I had not played lessons and the amp sim from one pc; Thanks for sharing your idea, though/