I'm running into problems loading complex feature services. Tile services seem to be working fine, and I've successfully loaded features that are simple, i.e. not many vertices roughly 40k vertices. I run into problems when the features get a bit more complex, particularly high number of vertices. I had failed to load a published dissolved layer of 1 polygon, but had a high vertices count (over 300k). I've successfully loaded a feature service with >500 polygons but < 5k vertices count.
The errors I have seen are "Errors encountered extracting features." after it initializes for awhile.