Alignment Trap Error !!

I just installed the Qt 4.7.1 version on my embedded device. While all the programs were running great on Qt 4.6, it is now telling me (for any program) that i have alignment trap, that seems to come from QtCore.
What is that?
for example:

Alignment trap: PC=0x40e2ef50 Instr=0xe5853000 Address=0x000468e9 FSR 0x813

I assume your embedded device uses a 32-bit ARM Core, in which case 0x468E9 is an invalid address as it is odd. You should track down where this address is used, what it is for, etc.