I just recently upgraded to v3, besides some minor issues which got fixed recently it worked find. But since the last minor update my Group Selector dialog is showing up, but imported scans nevertheless end up in the global inbox. Even if switch preferences from Group Selector to Global Inbox and back to Group Selector, still imported scans end up in the global inbox and not the selected group/folder.
This has been reported mutliple times. This is an issue when using the Metadata panel and should be fixed in the next maintenance release.
In the interim you can disable Preferences > OCR > Searchable PDF: Enter metadata after text recognition or just process items from the Global Inbox after scanning.
Thanks for your patience and understanding.