The Last Tile Finder has a but of an issue sometimes.
Have you tried walking a reasonable distance away from the entry/exit point & activating then?
Also if you have a different entry/exit point that will take you to another game scene...try that as well.
Always remember to move away from any entry/exit point before activating the Last Tile Finder.
Have you checked out the relevant Wiki pages, quests, maps, videos, guides, walkthroughs & hidden gifts.
In certain scenarios it is much more easier to consult, study & follow the Wiki maps instead of the videos.
You can easily find the solutions to puzzles if you check out the Wiki maps.....everything is clearly & concisely highlighted....including hidden gifts.
The Wiki pages & this forum will become your best friends throughout your Diggys Adventure journey.
MAPS - All Hyperion maps
VIDEOS - All Hyperion videos
QUESTS - All Hyperion quests
Mines, Maps & Videos
Fan Based Websites