For those utilizing WinApp Window client application, if you see a blank screen blank page after logging into the WinApp indicates that a WinApp upgrade is required. There is a new WinApp v.5.x available to download the client area. WinApp v.4.x and WinApp v.5.x are two different applications and the v.5.x is not an upgrade from v.4.x. Simply download and install the latest WinApp from the client area.
One other possible reason is the MySQL is not running or other MySQL or server related issue. Check the server error logs to see if there are more detailed information.
Another possible reason is the PHP page has errors. The "Blank Page and output PHP error to the page" documentation will provide more information.
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