Describe this in a lot more detail, or show us a screen capture of the problem. If there is an error message, please tell us the complete exact unedited word-for-word error message.
Adding folder to new catalog, part way thru reading. No trouble.
All pics read, total seems fine.
It seems that Loading dates is endless ... I could wait an hour and it would not change.
Only 50 pics are visible as thumnails, they are a mix of 20 year old shots, scans and new pics.
I don't see a reason for them to be shown while others are not.
If I click on the blank thumbs the correct image is displayed.
After starting the actual import "add", the 50 shown images are imported.
The program is trying to import the others but doesn't. See status bar at top left.
It seems to be zero and if I quit the program it tells me that there is an unfinished prcess.
2 hours later and there is no change ... but also no error messages.
The catalog lists the 2 folders that contain the trouble free 50 images only.
As I stated in my initial post importing the exact same folder in Lr 3.3 goes without hitch.
I even did a ver 6 (cc) trial which also had no trouble.
Only my standalone ver 5.6 does this.
What happens if you remove the videos from the folder before importing?