[SOLVED] Beatgrids

Hi, 

Im using the DDJ-s1 and have just gone from Itch to DJ.

Now none of my beatgrids are showing.

Im praying your not gonna tell me I need to re-analyse all my tracks. Ive made 100's of revisions to track data while using Itch (file names and key information) 

which I really dont wanna lose.

If i do need to re-analyse, can this be done without reloading the tags?

Many thanks

Tom