Also, asset forge fails to load OBJ files if they’re missing a newline at the end of the file.
This happens when exporting OBJ models from Block bench, for example.
Manually adding a newline will fix it.
Viewing post in importing .obj files on asset forge doesnt work
I'm guessing that the bug fixed in 2.6.0 is specifically the one about objs with a missing newline at the end?
I'm seeing the same problem as the OP (objects appear in the collection list, but it just shows a white background and they can't be added to the scene), and I have verified that the .obj and .mfl files have newlines at the end. I'm wondering if the bug I'm seeing will also be fixed as part of 2.6.0, or if this is caused by something else.
If it helps, I got this software to experiment with taking simple premade 3D assets and exporting them as 2D in isometric perspective. To test things out, I'm using this asset pack: https://kaylousberg.itch.io/restaurant-bits. I have mostly worked with 2D and so I will admit to not knowing how to check if the assets in this pack meet all the criteria for import, so apologies if I'm trying to do something unsupported. Also, to make things worse, I am on Mac and using the Mac version, sorry... ^_^; (I would much prefer to work on Mac, but do have the ability to try it on Windows if a Mac issue might be the culprit.)
One last piece of info in case it provides any clues on the problem. After trying the latest version (2.5.2), I tried 2.4.1 to see if that would fare any better. After I added the assets to that version, it hangs during startup in the "caching thumbnails" step. I left it for quite some time (at least 5 mins) before quitting.