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A display opened over plain http:// on a LAN address is not a secure context, so the browser gives it no Cache Storage. The media cache then fell back to the in-memory test double, which remembered only each slide's signed delivery URL and still reported it as cached. Online that looked identical. Offline, the next slide's URL could not be loaded, the slide was marked unusable, and local continuation kept landing on the image already on screen. The wall froze until the network returned. Without Cache Storage, the browser media cache now fetches and holds the bytes in page memory as object URLs (one per key, revoked on prune, replace and stop), so a running display keeps cycling through what it already has. Nothing persists across a reload; on such an origin the platform cannot cache the display page either. Regression tests: the media cache on an origin without Cache Storage, and the whole controller on an ordered fake clock, cycling for six slide intervals with the network gone and then handing back to the server. Co-Authored-By: Claude Opus 5.5 <[email protected]>