The other day Google Analytics did not display other than a blank screen in place of the usual Dashboard. At first I thought that the service was going under some maintenance routine but later during the day the issue persisted.
I verified to be logged in, I cleared the cache of Google Chrome, tried two other different browsers (Firefox and Safari) with no luck. Unfortunately it seems that there is not much documentation about this issue so if it happened to you as well you may struggle to find out how to restore access to the Dashboard.
Turns out the fix in my case was trivial.
Ad Blockers, like AdBlock or uBlock, may in fact interfere with the Google Analytics Dashboard.
If this is the case, simply disable your Ad Blocker for the domain https://analytics.google.com and you should be good to go.
Hopefully this will help.