You also mentioned problem with MMC card - what kind of problem?
Every now and then, seemingly without any pattern, my storage cards were being remounted RO. It happened once with my CF card, that could be a one-off, but it happened repeatedly with my MMC card, usually when installing apps.
I even rewrote my /etc/fstab to make it always read-write, made no difference.
To eliminate the chance of it being a hardware fault, I have returned it, I am now waiting for them to post a new one to me.
When it arrives I will test it again and reply to this thread.