QUOTE(Loke @ Oct 11 2008, 12:05 AM)

One of Mantak Chias students told me once that this kind of problem occure
because people meditate on the chrown chakra because they like to fly but
when the micro cosmic orbit still is closed this will cause a lot of trouble in their
mind.
If the microcosmic orbit is closed, you die. So I don't think anyone alive has a closed microcosmic orbit. Maybe they are not yet aware of it or maybe there are blockages, but it's there.
Concentrating on the crown chakra isn't just for 'flying', but it also pulls down tremendous amounts of spiritual energy from the higher soul/self, holy masters, higher spiritual sources. Also, concentrating on the crown chakra has a funneling effect on other chakras. So if you concentrate on the crown chakra, eventually you will feel that the energy is also going to the other chakras and eventually through the microcosmic orbit. And the energy you absorb through the crown chakra has a very high frequency, violet or brilliant white in color if you can see it. This high frequency energy can melt/disintegrate blockages in your system. So concentrating on the chakra in the long run also has the effect of stimulating the microcosmic orbit. Concentrating on the crown chakra will not cause problems in your mind, instead it will clear it. Negative thought-forms and energy will be flushed away. There are some who get "spaced-out" after concentrating on the crown chakra because of the intense spiritual energy, but this is only temporary and can be quickly remedied by grounding. High spiritual meditations that concentrate on the higher chakras must involve grounding in the end. This is why I recommend Meditation on Twin Hearts, it is a very powerful, multi purpose and multi-faceted meditation.
FOR THOSE WHO ARE INTERESTED TO TRY MEDITATION ON TWIN HEARTS, HERE IS THE LINK
http://www.meditationontwinhearts.org/