i already have tried doing the hardreset and reinstalled all of my apps one by one and i found out that when the UDMH is enabled i cant view or the screen goes white when opening a PDF file in Docs To Go. i also tried enabling UDMH and adding DocsToGo in the list and selected to disable UDMH is this app but it still the same.
i double checked this by installing only UDMH and Docs To Go v8.001 (143) after the hardreset.