My GM says Druids are able to use any armor as long as it is non-metal. That being said, the Dragonhide Fullplate still gives the armor check penalty to my attack rating and skill checks.
Druids are proficient with light and medium armor but are prohibited from wearing metal armor; thus, they may wear only padded, leather, or hide armor. A druid may also wear wooden armor that has been altered by the ironwood spell so that it functions as though it were steel. Druids are proficient with shields (except tower shields) but must use only those crafted from wood.
A druid who wears prohibited armor or uses a prohibited shield is unable to cast druid spells or use any of her supernatural or spell-like class abilities while doing so and for 24 hours thereafter.
Unless you take Armor Proficiency (Heavy), your druid will not be able to wear Full Plate without penalties, regardless of Dragonhide or not.
Cancelling as this is not a Program error.