Actually I must correct my previous post.

The problem does NOT occur in Minimo ( I was wrong) but it does always occur in opera if I boot from mmc2.

I upgraded my tablet to IT OS 2006 V2.2006.39-14, then cloned it on mmc2.

Never experienced the problem in IT2005 or IT2006.26-8 !!

Like fanoush , the only difference between flash and mmc2 is ext2 filesystem.