FS becomes readonly

[kraleksandr]

After I tried to remove one folder, my sdcard becomes readonly

Terminal

xbian@xbian ~ $ mount
/dev/mmcblk0p2 on / type ext4 (ro,noatime,data=ordered)

Looks like there is some FS errors. Ok, i've did this

Terminal

sudo shutdown -rF now

It helpt, fs back to normal on next boot. But when I try to remove this folder, it becomes ro again.
Cant understand this...

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Ok, fsck, remove, fsck, remove, fsck, remove... Now this folder completely removed.
And another question: red-colored filenames started with ? - what is this (MC filemanager)?