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I have been working on a new site for several days now and have been implementing a new dashboard controller that is looking great however, I have just tried to login to the Umbraco admin page:
And I am being presented with a white screen:
Did you fond out what was causing this and how to fix it?
I'm having the same issue. It just started happening a few days ago. This happens on IE and Chrome.
What's weird is sometimes everything loads normally and you can use the console to do everything you normally could but if you refresh the page it goes back to blank.
Took some digging but it looks like this is the fix for the issue I'm experiencing: http://issues.umbraco.org/issue/U4-6559. A third party add-on was assigning duplicate keys to their server variables and causing a conflict.
Looks like an upgrade is in order but in the meantime I was able to fix it in the short term by setting debug="true" in the web.config in the root folder of the site. Don't ask me how or why that made it start working. This might not be adequate depending on your security policies but it's at least working again.
I had the same problem (Umbraco v7.3.1, in Firefox v42), and what caused the problem was an underscore in the (local) domain.
Replacing the underscore with a hyphen (so from _ to -) fixed it!
I had the same issue when using a ip adress instead of hostname e.g. http://10.0.0.50 . The backend would fail and show a blank page but assigning a hostname fixed it.
Does this happen when using an Incognito tab?
I was having similar issues recently but everything was working fine on Incognito.
Turned out a Chrome extension (Responsive Web Design Tester - which has been removed from the Chrome web store by the way) was causing a conflict.
I narrow it down by disabling all Chrome extensions and turning them back on one at a time until Umbraco broke.
I actually found that this was related to Firebug. Any time I would have Firebug enabled when the page first loads, it would fail completely.
Thanks Jason, that was exactly it!
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