So im using most recent updated version of AE & I frequently get problems with the export which look fine in the Ram preview. Some shots just export as a glitchy still, some shots totally disappear.
Also I sometimes get a problem with the preview and the exort (for example a layer is visible in the composition but not showing up on preview or export) SO FRUSTRATING please help!
Things i've found really cause problems are cosmo plugin, lens flare and rotobrush ?
If you have MP turnef on turn it off. Purge everything. Try rendering a lossless master.