First off, thanks for reading+replying. Worth noting that I’m a huge fan of Plex and the work that y’all do. This hit me in the middle of a critical moment last night 
I can’t provide client + server logs at the moment, but will follow up when I can.
Here’s another one of the more recent posts on it, but you can find others on Reddit as well.
Based on those other posts, it’s likely that this happens in situations where the Server, quite justifiably, only wants to allow one device or authenticated session per Client. As discussed in these threads, one solution is to have the server change this setting (“Remote streams allowed per user”). Increasing this number apparently fixes the issue.
The problem with this solution is that it’s a band-aid… and not really what’s happening; the Client isn’t using multiple devices, or opening multiple browser windows or anything like that. The client is ONLY scrubbing around a single video during a single session, and Plex seems to think that this activity constitutes “too many active streams”. So the server would be forced to allow multiple streams per client (which they might not want to allow), just to let a single user be more agile with their video controls.
I’ll try to get logs pulled when I can, and thanks again for reading.
