@myghi63 I have the same problem, but discovered something interesting:
In any WM or DE it does not work properly so you need to follow some steps before yo can drag your image freely, like modify the speed manually. After then you can drag the speed.
What I did was try to copy some libs from the AppImage package but it did not work, the problem was there, then I messed (obviously) my /urs/lib/ folder after copied all those libs there.
So, I installed a new fresh Arch in some partition, installed LXQt DE (because I wanted something easy and fast to only copy the /usr/lib folder) and copied all the /usr/libs/ folder to my existing installation to try to recover my machine.
It worked so I was able to login again to my main machine and discovered something interesting:
Olive Video Editor worked! That thing with images worked out of the box.
So, I came with the idea that some library is messing with that feature of the editor.
I tried to install a new Arch machine with LXQt at first then olive but it did not work, same problem with images.
Then tried a new installation, with i3, then LXQt, then Olive but no.
Then first Olive, then LXQt, but no again.
After, installed Arch, i3 and Olive, and in a different partition a new installation with LXQt, then copied the /usr/lib folder to the i3 setup with all the files, reboot, entered to the i3 install, run Olive, tested adding images... And it worked!
So we need to figure out which library is causing that, with library we need, so only copy that library and not all the folder, so we can not damage our system.
Something strange or rare is, it does not work if you install LXQt, but it is okay if you copy the /usr/lib folder.
I am a newbe so I am still trying to figure how to do it the good way.
Any help (since Olive is unsupported now) is well received.