We received requests for a problem with certain screen resolutions, 12 inches for example, we reported these requests to the teams.
Some players seem to encounter problems to finish some puzzles (Krystal key for example).
It is important to check that your graphics card drivers are up to date with PC versions, please refer to the FAQs, check all the points of faq : Glitchs and graphic problems.
If the problem persists, we encourage you to try a screen resolution of 16: 9 ratio, and if you do not want to see the Savegames FAQ.
In the meantime more information we will do our best to propose solutions.
Thank you for your understanding.