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The caching process sometimes creates blank and/or white tiles when using Mosaic datasets. When this happens no error is reported in the server log because the tiles are actually created in the cache folder but are white.
The map caching process draws the map data for the extent the cache tiles need. In that process, sometimes raster datasets fail to display all the images in that extent and results in creating white tiles.
There is a parameter called 'Maximum Number of Rasters per Mosaic' available in the Mosaic Dataset Properties dialog box whose default value is 20. This prevents the server from mosaicking an unreasonably large number of rasters if, for example, the client zooms in to an overview scale in a non-optimized image service dataset that has no overview tiles generated.
Increase the 'Maximum Number of Rasters per Mosaic' value to higher number so that all the images are visible for the required extent in the caching process.