Help solving a SystemStackError while testing

I have a model that uses both acts_as_taggable and betternestedset.

When I call "destroy" in my model unit task, the stack level gets too
deep since Rails puts it in a transaction. Stack is here:
    /Users/alan/Projects/superb/vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb:220:in
`reload_without_tag_list'
    /Users/alan/Projects/superb/vendor/plugins/acts_as_taggable_on_steroids/lib/acts_as_taggable.rb:220:in
`reload'
    /Users/alan/Projects/superb/vendor/plugins/betternestedset/lib/better_nested_set.rb:161:in
`before_destroy'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/callbacks.rb:322:in
`send'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/callbacks.rb:322:in
`callback'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/callbacks.rb:294:in
`destroy_without_transactions'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/transactions.rb:104:in
`destroy'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:66:in
`transaction'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/transactions.rb:80:in
`transaction'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/transactions.rb:100:in
`transaction'
    /Library/Ruby/Gems/1.8/gems/activerecord-2.0.2/lib/active_record/transactions.rb:104:in
`destroy'
    ./test/unit/task_test.rb:30:in `test_create_read_update_delete'
    /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/active_support/testing/default.rb:7:in
`run'

Any suggestions on how to get past this? (turning off transaction in
the testing_helper didn't appear to have any affect.)

Thanks in advance,

Alan