please check videos produced by new versions of VidCoder and Handbrake with MediaInfo, you will notice thet they have VFR flag set to YES.
You will get rid of of the issues with fast forwarding only when you select framerate
manually in Settings -> Video> Framerate.
So, please do test encode manually selecting 23.976 fps (DO NOT SELECT SAME AS SOURCE!) and test the resulting file on your streamer.
VFR is very good feature but it's currently not compatible with too many hardware based media streamers.
You can check the video info also on streamer, Info button should show you the actual framerate but for VFR it shows usually 0 fps which is obviously wrong.
Container wise, MKV is usually more affected by this, while Mp4 with the same streams inside plays and FF-s fine.