Dashboard Fails to Load When New Browser Window Opened

Hi,

I have a report/dashboard drawing data from an excel spreadsheet using onedrive refresh.  Both the data refresh and update of the PBIX file, which is also in my onedrive folder, has worked flawlessly for months.  However, at about the time I started using the Power BI Desktop app from the Store a couple of weeks ago, rather than the downloadable version that I had been using, my online dashboard has gone haywire.

When I open a new browser window and attempt to access my dashboard, whether using Chrome or Edge, I get the following error.

"Something went wrong, Unable to load report" and "Status Code 500".   

This occurs when I log in fresh - but also if I close Edge while remianing logged in and reopen Edge and navigate to my dashboard.  I haven't cleared cookies, logged out, or anything.  But yet this happens every time. Chrome too. Edit - if I even let the page sit too long, say 10 minutes, and hit my browser's refresh button, it fails to re-load. Tested on two separate Win 10 PCs.  

They only way to access the dashboard again is to go to Datasets and manually click refresh. This makes no sense however as the dashboards are set to autoupdate every 2-4 hours and have been doing so successfully for months - even now they're updating fine.  And even when I havent edited the data or the pbix file for days, I still have to do this when I close the browser and immediately open it back up. I essentially have to click manual refresh every 5-10 minutes to be able to access my Dash, even if I have not been tinkering with the files.  

This all seems to be correlated with me switching to the Store version of Power BI.  I've signed in and setup my oauth, my changes even propogate as expected with onedrive refresh, but I cannot access my dashboard from any browser without manually clicking refresh in Datasets. Everything seems to be functioning behind the scenes until I try to access the Dashboard.  

I have another report that is not part of my Dash that is loading fine...its just 1 of my 2 reports (the one the comprises the Dash)