Regarding the inability to make a director decision: have you at any time reset the options in Step 2 (Submissions) or 3 (Review) of the Conference Setup -- especially (but not only) around the 4th? Unfortunately, OCS 2.0 doesn't handle changes to the scheduled conference setup pages particularly gracefully, although 2.1 does. If you have changed the type of submission materials you accept in step 2.1, any items submitted against the first submission process will be slightly orphaned. I would suggest that if you have made any changes to any option in either of those steps, to revert the changes and see if you can then commit a Director Decision.
You may also want to take a look at the following thread for advice on how to revert a Director's "Complete" action: viewtopic.php?f=3&t=3064
Please let us know how this goes, or if you need any further help.