Howdy
After upgrading to CC2019
I started working on an edit where I was given MKV files, when I added them to my bin, I created a new sequence from clip. From that timeline I began selecting my clip segments in the Source window, when I went to drag the video to the timeline, there was a circle with a slash through it, preventing me from adding it to the timeline I had created.
At first I thought this was a codec issue, so I used media encoder to transcode all the footage to H.264 and match source - high bitrate. Bringing this footage back into the bins and creating a new timeline from the first transcoded clip selected, I went to drag and drop a new in/out point from the source window and I was greeted with the same circle with a slash through it unable to move it to the new timeline I had created with the transcoded footage.
For reference, I am working on an AMD Threadripped CPU, GeForce 1080 GPU, and Windows 10 (64 bit).
Please let me know if I am overlooking anything to resolve the issue.