Ooops, I mean V20 403.
I've been making gopro timelapse videos from images captured twice per minute for 3 to 7 days (depending on the SD card size).
The gopro images are in multiple folders containing a maximum of 999 images.
To keep things simple I generate a separate video from the contents of each gopro folder, then create the final video from those 33 second videos.
To create each folder's video I open the folder in the Vegas explorer, select the first image (any would work, really) then move the cursor and hit control-A to select all the images. I would then hit the left mouse button and drag them all to the timeline, with preferences set to 1 image per frame. After I render that folder's video I delete all the images from the timeline, delete them from the project media, save the file and continue on to the next folder.
Today, using V20 403 for the first time, I would select all the images as described above but when I move the cursor and attempt to drag all the selected images to the timeline they are all deselected and only the random mage the cursor is over is moved.
I stumbled on the add folder to timeline option, so was able to use that to get the images to the timeline, but when it came time to move all the folder videos to the timeline I had a similar problem. I could select them, but it was difficult (but not impossible) to drag them all to the timeline at once.
I'm using an HP Omen laptop
Windows 10.
32GB ram,
Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz 2.21 GHz,
NVIDIA GeForce GTX 1070 with 8GB memory.
FWIW: I fired up vegas to check a few things while I was composing this post and it crashed...