OK, last one. Found a third 3d video I created in Videopad and exported in 5760x2880 very recent.
If I could read the cache files it might help.
OK. SO I did it JUST NOW. But I was not able to replicate my previous success, which was to make a 3d video out of a 2D one and export it at high resolution. But the original poster asked if he could edit his 5.7k vids and export them. HE CAN!. I just exported a videos in 5760x2880, 5760x5760 and 6224x3112. I used the "lossless" video export.
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It a shame I can't make 2D videos into 3D videos and export them at say, 5760x5760, like I used to. NCH must be able to make a fix for this, like allow extra options on the lossless option window to include, 'Make this a 2D to 3D video".
So. A caveat. You can trim and cut parts out of the video and then export original resolution using lossless export, but you CAN NOT use any video effects such as saturation, contrast etc. It will not export in lossless with video effects. (but it used to).