Just received confirmation from listener Terry that the PlayPod update will fix any feed issues with the MacCast. Please read the response, especially the warning about backing up your subscription URLs since you will need to resubscribe to all your feeds. UPDATE: Please read comments below from the developer on backing up your feed list and reporting bugs.
By downloading the latest version of Playpod I now get your Maccast feed up to the most recent podcast. So, all playpod users will have to upgrade to the latest version of the software.
One word of caution. When you install the latest verison it wipes out all of your old feeds. So, users may want to record all of their feeds so they can resubscribe in the latest version of playpod.