When exporting to h.264 from Premiere Pro CC 2018, the Media Encoder ignores the first set of keyframes in audio effects. This results in a weird jumps in the audio effects at the beginning of the video. To replicate:

1) Apply the Mastering audio effect to a clip
2) Create some keyframes with initial values for a few parameters
3) Create a second set of keyframes later in the clip that modify those same parameters
4) Create a third set of keyframes modifying those parameters
5) Export the video to h.264 mp4 using Media Encoder

Expected behavior:

Video should contain audio that tweens smoothly between the keyframes.

Observed Behavior:

Audio track starts with the values specified in the third set of keyframes, then jumps abruptly to the values in the second set of keyframes when playback reaches that point in the video. Keyframes after this seem to work normally.

Workaround:

Reset the status of the job in the queue and re-render the video. Media Encoder will only honor the keyframes in the audio track the second time you render that job.

This workaround is annoying because you must render the job twice to get one proper video.

There is the ability to Apply a Name overlay to any clip but it remains limited in using the stitch clip function. Currently if you add the effect to a stitched clip it would add the name of the overall stitched clip and not the name of each individual clip.
I am advocating for the addition of a radio button to enable per clip naming.
The current work around is exporting all clips to be stitched through media encoder individually with the effect > name enabled and then take all of those exports and create a stitched video from it. While a bit redundant and potentially tedious, this current workflow functions but could be streamlined.

Windows 10 - 32GB RAM - GTX1080
When I export a show with embedded closed captioning as an OP1a MXF from Premiere Pro 14.8 to Media Encoder 14.8, the captions are being changed from .scc to .mcc. I am exporting an HDCAMHD 50 MXF that has 608 and 708 captions that were imported from Scenarist files (.scc). When I go to the captions tab in PPro, I am selecting "Embed in Output File." Below that, the greyed out boxes confirm that it is a .scc file. I can even check "Create Sidecar File" and .scc is still one of the options. Everything is correct. I have done numerous times before. However upon queuing to Media Encoder, the captions tab show ONLY Mac Closed Captions (.mcc) Timed Text (.xml) or SubRip (.srt). There is no longer any option for Scenarist (.scc) files.

This is a new issue, as I have used this workflow many times before. So, currently, I am having to export directly from Premiere in order to get embedded Scenarist closed captioning in my MXF files for broadcast. Can this be fixed RAPIDLY???????

When encoding MP4 files from Media Encoder or Premiere Pro the exported file is missing the SAR and DAR values.

This can be easily check with ffprobe and this command:
ffprobe -v error -showformat -showstreams file.mp4
[STREAM]
index=0
codecname=h264
codeclongname=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Main
codectype=video
codectimebase=1/50
codectagstring=avc1
codectag=0x31637661
width=1920
height=1080
codedwidth=1920
codedheight=1088
closedcaptions=0
hasbframes=2
sampleaspectratio=N/A
displayaspectratio=N/A

As you can see above the encoded file shows N/A values instead of the expected SAR value 1:1 and DAR value 16:9.

I have of course tested with other source files and mp4 files from other vendors and they provide these values in the mp4 files they create.

Is this perhaps a bug or missing feature?

Hope for a resolution in the near future :-)