I'm trying to track down some junk in my image, but when I do

PointerFinder on: ((ActivityPlan allInstances select: [:x | x activity
name = 'sizing']) at: 1)

I get, after a very long, CPU intensive delay, a blank pointer finder
window.

Originally the select: produced a long list, some of which apparently
was garbage collected while pointer finder ran.  That produced an
empty result to, but that makes sense.  In contrast, the one remaining
item above does not get garbage collected, but I can't get its roots.

Any ideas what's causing this, or how to fix it?

Thanks.