I'm having some trouble streaming my 720p movies. My setup has a 2.93 GHz iMac with multiple MyBook externals hooked up through Firewire400. I'm running through a wired network (not gigabit though) to my Mac Mini. They are talking fine, I can transfer files, I can see files. I added a bunch of 720p movies (encoded in Handbrake for ATV) to my Plex library. It sees them fine, but when they are remote it just says "Error opening file" when I try to play them. There is 1 that will play for some reason. But I copied another one directly to the Mini and the local copy plays but the remote copy still won't. I bumped up the cache to 20 seconds which is when I found that one movie would play, but none of the others will play yet. I'm just starting out on Plex this week. Any help would be great. I'm loving it so far, but hoping I don't need to shuffle my drive strategy too much. My plan was to only keep MKV's local to the Mini. Thanks for any help. Edit: I just started looking at file sizes. The one that works was 1.79 gig and the rest were over 2 gb. I found one that was 2.02 and it plays. Is there a way to resolve this within my current configuration?