Hi, I have encountered this problem for a long, long time. It does not matter what I do (well, sometimes the L5 just freezes, but usually it only takes 150% of my cpu (I have 2 cores).
This time I was reading NA28 and BHS, just checking some words every now and then. I noticed that the sync arrows were going about even though I had switched L5 to offline mode on previous time (obviously I had had to force quit, so the settings were not effective?).
Here is a sample before the force quit:
4062.LogosLogs.tommi (before force quit).20131111-192736.zip
And here is archived log after the force quit:
4657.LogosLogs.tommi. (incl and after force quit) 20131111-192854.zip
Macbook Pro (mid 2009)
OS 10.9
2.26GHz Core 2 Duo
8Gt 1067 MHz DDR3
NVIDIA GeForce 9400M 256 MB