Update and workaround: this seems to be a known and widespread bug (that was reported widely by developers during beta testing) that largely seems to impact the icon view in finder. Users are reporting that the problem seems to not exist in the list view on finder. Until apple gets their act together with this update, the workaround that seems to be working so far is to change all finder views to list view. I have done so and I'm able to drag and drop as usual. See this thread for many other issues: https://www.reddit.com/r/MacOS/comments/1wgek2q/macos_27_golden_gate_bugs_and_issues_megathread/
Here are the instructions for changing the finder views to list view: To set List view as the universal default across all Finder windows and folders, follow these steps:
1.Open a fresh Finder window:Start in a standard folder like Documents or Downloads.Open Finder and navigate to your main Home folder or any standard directory.
2.Switch to List view:Press Cmd + 2 on your keyboard (or click the List view icon at the top of the Finder window) to change the view layout.
3.Open View Options:Press Cmd + J (or select View > Show View Options from the top menu bar).
4.Check 'Always open in list view':At the very top of the View Options panel, check the box for Always open in list view (and check Browse in list view if available).
5.Set as default across macOS:At the bottom of that same panel, click the Use as Defaults button.
Nuclear Option: Reset Folder Views via Terminal
If individual folders have custom view settings stored in hidden .DS_Store files, they might ignore the global default and stick to Icon or Column view. You can clear those custom settings system-wide using Terminal:
- Open Terminal.
- Run this command to delete custom folder view preferences across your account:
- Bash
find ~ -name ".DS_Store" -depth -exec rm {} \;
- Restart Finder:
- Bash
killall Finder
Once reset, every folder will automatically conform to the global List view default you just saved.