So the question becomes: do you post your career critical questions on an anonymous board, or do you send them in via an official union communications channel? You may get a more timely response from an APC posting, but can you be sure that the information is accurate? I'm betting Sonora is exactly right, but wouldn't you want an official answer from the people whose "job" it is to communicate accurate contract information to their members?
I get the frustration with the PDR system. Sometimes there is a lag between the question and the answer. Keep in mind that you are dealing with volunteers. Also keep in mind that these same volunteers are committed to the success of the PDR system, and getting the information out to their members.
If you send in your questions via a PDR but don't get a timely response, then call your rep. They can run down the information, or ping the committee to get the PDR answered. Or, you can call your local committee chairman/member and pose you questions to them. Easy stuff.
It's your dues money. Use the services that are available to you, and hold your reps accountable for any shortcomings.
Hog