There are multiple WP forum posts regarding WordPress Admin pages that simply fail to load, or load empty pages. When the Admin page fails to load, WordPress provides no default error code, something that would assist both the Developer, and the User in determining why an error has occurred.
In fact, WP users who experience that blank Dashboard error are often unable to agree upon a common fix for the WP blank error issue. Some suggested fixes have involved removing spaces from the PHP file, but with no commonality, or closure to suggest that one solution will work in every situation.
We will do all that we can to replicate your installation if you can provide us with WP version, PHP version, mySQL version, host provider, theme, and anything else that would assist us in troubleshooting this error.
You are not required to update to 1.3.7. We’re glad that version 1.3.3 is working for you.