I get this on a Moto Q9h with 6.1 ROM with no 3rd party apps installed. Have tried setupOTA driver and beta BJ II, both of which appear to install RFS6_1.3.29.3060.CAB.
Java in ROM is build no v3.2.7, 20080229b (no vendor name)
Using Start softbutton or the Redfly WIndows key gives a Window called RF Start, with the left soft key labelled Up. Pressing this has no effect.
Pressing Backspace (i.e. back arrow) displays the Program icons for a half a second, before the screen is overwritten by the white screen. Whilst the Program icons are showing, the More and Menu soft key labels momentarily appear (but too quick to press). The Top row window title does not change from RF start. The only way to exit this is to press the home key to get back to the Today screen.
Edit:
Pressing the Q key whil in the RF Start window got rid of it and dropped back to the Programs screen, which now works normally. One difference is that the Windows key no longer works, so you have to use the Left button to launch Start. Rebooting the phone kicks off the RF STart window again.