Reply to Traktor S4 and BPM's

Hey guys, i posted this on NI community s 3 days ago and havent gotten any response,pretty weird since i have read some users having BPM scanning issues.Hoping i'll have a better result on these community s!!

Has anyone else had this problem? I analyzed tracks from an external drive because thats wherei keep all my music and it shows the BPM for some folders and not others.In some folders the BPM shows for one song but not the rest...After i finally got the S4 to work on a Windows laptop(by reading this community of course) without drop outs and crackles, now this,ugh,frustrating.
I've been a Virtual DJ user since it first came out (ver. 5?) and loved the simple process of scanning for BPM's and i dont see anyhthing like that in Traktor for the S4.Could it be a Windows issue again?
I have about 2TB of music on an external andf believeing about inputting the BPM's manually.
Please HELP!
Thank you