Can I restore a Titanium backup from an Incredible to a Captivate?
May be the app is not recognizing the location of the backup. Do the following and see if that works


Remove all the backup files from the new Samsung Captivate 
Now, from Captivate do a Titanium backup, it will create a backup folder with backed up apps. 
Then, copy all old backup files from HTC to that location. 
Try titanium backup again, this might show all the backed up apps now.


Hope that works. Good luck :-)