Tests all error after upgrading to 6.5 beta

I have an existing Rails project where tests pass fine on the command
line, but from inside NetBeans they all fail with an error in
create_fixtures, even though this test doesn't use any fixtures at
all.  I was developing this project and running test cases just find
in NB 6.1.  Here is a sample stack trace:

4) Error:
test_select_date_with_invalid_date(RecordForeignReprescribeControllerTest):
ArgumentError: interning empty string
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:251:in
`to_sym'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:251:in
`create_fixtures'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:250:in
`map'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:250:in
`create_fixtures'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/base.rb:867:in
`silence'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:248:in
`create_fixtures'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:593:in
`load_fixtures'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:547:in
`setup_with_fixtures'
/Users/superchris/dev/medwiz/medwiz/delanor/development/config/../vendor/rails/activerecord/lib/active_record/fixtures.rb:575:in
`setup'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/test/unit/testcase.rb:77:in
`unlogged_run'
/Users/superchris/dev/medwiz/medwiz/delanor/development/test/functional/../test_helper.rb:72:in
`run'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/test/unit/testsuite.rb:34:in
`run'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/test/unit/testsuite.rb:33:in
`each'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/test/unit/testsuite.rb:33:in
`run'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/test/unit/ui/testrunnermediator.rb:46:in
`run_suite'

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