Posted: 24/01/2013 at 13:57
To me, it looks like the leaves have been badly scorched by sunlight, earlier in the year. I have had the same with my Moth Orchids because mine are standing on a window sill facing south-east where they get too much direct sunlight. They need lots of indirect sunlight, so a sill facing east or west would be best.
You have repotted it correctly and is otherwise looking very healthy. After flowering a new leaf usually appears.
Instead of watering once every week I would be inclined to mist one week and water another week until it gets warmer and brighter again. Water temparature should be lukewarm and preferably no tap water. When the roots are still green, no watering is needed. Hopefully the orchid will recover soon.