I'm pretty sure that i'm facing exactly the same problem. i am very disappointed since we're running arcgis 10 SP4 desktop and the bug is still present. ;(
i'm facing the same problem when clipping (large portions of) the mosaic dataset instead of exporting the entire mosaic to a file geodatabase.
anybody an idea how to export/clip 20'000+ tiles from a 200'000 tiles mosaic dataset? or any hints tipps and tricks how i can assemble those 200k 4megapixel tiles to a raster dataset, regarding the fact that the mosaic's uncompressed size is around 3.7TB (8bit unsigned)?
since the 'mosaic to new raster' tool doesn't handle even 10000k tiles to build a mosaic at once, i ran out of ideas!
every hint is appreciated!
ps: the mosaic consists of rectangular non-overlapping jpg+jgw tiles, covering the site seamlessly without caps. no fancy footprints etc.