creating/deleting cue points on tracks with high play count very slow

Hi,

i'm running  RB 6.5.1 on my macbook pro. When I try to add or remove cue points on tracks with a high play count, it's really, really slow.  Clicking to delete a cue point shows the waiting cursor for about 10seconds. :(

When doing the same on a fresh imported track it's fast. any ideas?

Br

P.