Updated 2/25 Unofficial PPCK Build Updates 20954, 210xx, 21015, 21018

[FormerPalmOS]

Could be a color setting somewhere in HKLM\System\GWE\SysColor. Try installing a different .tsk file (the default VZW tsk for sure over-writes the above color settings) and see if the flash goes away or changes. If so, this could be your problem. It could be something else completely though.