Redmine API doesn't work after 2.0.3 upgrade

Was previously running 1.0.1, and had some simple code to call the API. After the upgrade, I now get a 500 error on the post.

Log shows something like this:

Started POST "/redmine/issues.json" for 127.0.0.1 at Thu Jun 28 16:12:37 -0400 2012

MultiJson::DecodeError (705: unexpected token at ''issue': { 'project_id': 'asystem','subject': 'Object reference not set to an instance of an object.','description': 'Stack Trace:    at App.proxy.CheckStatus() :
  json-1.4.6-x86 (mingw32) lib/json/common.rb:146:in `parse'
  json-1.4.6-x86 (mingw32) lib/json/common.rb:146:in `parse'
  multi_json (1.1.0) lib/multi_json/engines/json_common.rb:9:in `decode'
  multi_json (1.1.0) lib/multi_json.rb:79:in `decode'
  activesupport (3.2.6) lib/active_support/json/decoding.rb:17:in `decode'
  actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:47:in `parse_formatted_parameters'
  actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:17:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
  rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
  rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
  activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
  activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
  activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__940163778__call__4__callbacks'
  activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `send'
  activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `send'
  activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
  railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.1) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.1) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call'
  rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
  rack-cache (1.2) lib/rack/cache/context.rb:143:in `pass'
  rack-cache (1.2) lib/rack/cache/context.rb:155:in `invalidate'
  rack-cache (1.2) lib/rack/cache/context.rb:71:in `call!'
  rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
  railties (3.2.6) lib/rails/engine.rb:479:in `call'
  railties (3.2.6) lib/rails/application.rb:220:in `call'
  railties (3.2.6) lib/rails/railtie/configurable.rb:30:in `send'
  railties (3.2.6) lib/rails/railtie/configurable.rb:30:in `method_missing'
  rack (1.4.1) lib/rack/urlmap.rb:64:in `call'
  rack (1.4.1) lib/rack/urlmap.rb:49:in `each'
  rack (1.4.1) lib/rack/urlmap.rb:49:in `call'
  thin (1.3.1) lib/thin/connection.rb:80:in `pre_process'
  thin (1.3.1) lib/thin/connection.rb:78:in `catch'
  thin (1.3.1) lib/thin/connection.rb:78:in `pre_process'
  thin (1.3.1) lib/thin/connection.rb:53:in `process'
  thin (1.3.1) lib/thin/connection.rb:38:in `receive_data'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run_machine'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run'
  thin (1.3.1) lib/thin/backends/base.rb:61:in `start'
  thin (1.3.1) lib/thin/server.rb:159:in `start'
  thin (1.3.1) lib/thin/controllers/controller.rb:86:in `start'
  thin (1.3.1) lib/thin/runner.rb:185:in `send'
  thin (1.3.1) lib/thin/runner.rb:185:in `run_command'
  thin (1.3.1) lib/thin/runner.rb:151:in `run!'
  thin (1.3.1) bin/thin:6
  bin/thin:16:in `load'
  bin/thin:16

How do we get around this?