I've now managed to get discs successfully burning with Toast - I needed to use the Video TS folder option rather than DVD Video.
I still don't understand why I can no longer burn with Premiere Elements, but at least I have a workaround.
The DVD disc labelled 4.7 GB/120 min in reality is 4.38 GB, not 4.7 GB. If the Space Required in the burn dialog is greater than 4.38 GB (no check mark next to "Fit Content to Available Space", you will get the "insufficient disc space message". If you want to continue in that project, then you have to place a check mark next to "Fit Content to Available Space". That allows the program to lower the bitrate (from its max 8.00 Mbps) to make the fit. The more the program needs to lower the bitrate the more likely lower quality end result.
You can also consider using DVD Double Layer Single Sided disc which is labelled 8.5 GB/240 min (in reality that disc is 7.95 GB).
Based on the above, I am not sure why Toast was your answer unless it uses these adjusts automatically out of your view.
Please review and consider and then let me know if I have interpreted your question and workflows correctly.
Thanks. I should have pointed out that "Fit Content To Available Space" was ticked. Elements said that it needed 4.38 Gb for the video, but Toast said 4.2.
Thanks for the reply and additional information.
Please consider disc capacity, file size, and bitrate....
If your Premiere Elements burn dialog Quality area was showing 4.38 GB with "Fit Content to Available Space" enabled, what was it showing for Bitrate.
Unless the program had to lower the bitrate to 1.69 Mbps or where it could not lower the bitrate any further to make the fit, you should have been able to get a burn to disc in Premiere Elements. The quality would have been worse case at the extremely lowered bitrate, but a burn to nonetheless.
If you want to pursue this, we could compare the Space Required and Bitrate with and without "Fit Content to Available Space" to get at
what triggered the Insufficient Disc Space message. We could also look at the Scratch Disk "Disc Encoding" to find to where it is
directed and how much free space is at that location.
If you have the time and want to follow up on this, please let us know.