[sooperlooper-users] Strange behavior during overdub.

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When going straight into overdub from record, a weird thing happens. All audio stops. It says its overdubbing, but all activity has stopped. I tried increasing memory (turning up seconds of memory and hitting committ changes), but it seems to make no difference. I thought I might be out of memory (1gb ram, 1.5Ghz Powerbook), but even if I turn down seconds of memory, to say 30 seconds, after I hit commit changes, nothing happens. Available memory remains at 47.5. I tried rebooting Live and SL but to no avail. Any ideas? This only happens on passages longer then 20 seconds so it seems to be a function of memory. 
Thanks
MFC