What’s the issue exactly? Do you have the import dialog freezing?
If so, that’s a know issue that is already fixed (just a bit too late for 4.6.0) and will be in 4.6.1.
Workaround:
Edit your darktablerc and change:
ui_last/import_recursive=TRUE
to
ui_last/import_recursive=FALSE
And restart darktable. And avoid using the recursive mode in the import dialog (or do this only after clicking on a directory after selecting a place).