Yes, having the same problem. October, 2020. Ads are starting to appear during Doc Martin episodes, even though we subscribed and pay for Acorn through Roku. $5.99/mo. Here's what we do. On our Roku TV we navigate to the Acorn box, click on it, then click on the Doc Martin box, then navigate to the episode we want, then start watching, and pretty soon here come the ads.
So, how to get Doc Martin without ads? Also, is there any way to watch Doc Martin episodes from Season 3 and onward in high definition? Acorn seems to stream low def.