Unfortunately it appears to be a problem with Google Chrome... more than likely to do with Google Ads, as the annoying advert below the screen appears briefly & then disappears only to leave a big black square in the middle of the screen. Firefox is fine. In Chrome: If you have disabled pepperflash because of the issue with the space bar, it seems this could be the cause. I re-enabled the pepperflash on my browser & the problem seemed to right itself, unfortunately this brings back the space bar issue.
Either live with the space bar problem or change to Firefox or one of the other browsers. Like many others I switched to Chrome because the meter seems to have a smoother flow than many of the others.
hope this helps.