6101 error when adc is set to "long"

[petmar]

Hi!
I run PT 9.0.0/Mac OS X 10.6.5 on a MBP i5 2,4 ghz and when I insert a plugin,
may it be the EQ 3 or a cpu hungry reverb, during playback I will get a buffer error 6101. Buffer set to 1024 and adc to "Long".
When set to "short" it performs much better and when completely off it works flawless.
It behaves them same way wether I have "Pro tools aggregate" running or my 002rack, daisy chained with a fw drive.
I understand the extra strain for calculation for "long" but is anyone else experience this behavior?
I can still work of course but it's a little bit annoying for the workflow.

[petmar]

It seems like once the plugin is inserted and then unloaded and inserted again it works.
Like if it is been loaded in some cache memory and rememberd.
Can it be some graphic issue? Like the EQ 3 is not a heavy plugin but has a complex ui.
For now I just go with the "short" adc and make some more music.