This started on 4.8 with ESPN Score Center. Now tonight while on 4.9 I installed "Scrollable ContactWidget" & "Super Battery" widget. Rebooted the phone, and after it came back up widgets were no longer on the screen nor was I able to add them again. Only uninstalling and reinstalling the entire App allows me to add the widgets again. But once I reboot, again they are gone. Any ideas or help? Is this a ROM issue? Update: Nevermind! 2 minutes after posting this I realized it was because these apps were installed on my SD card. Once I moved them to the phone, put them back on the screen and rebooted all was well. I guess typing it out got me thinking!