My save games also keep on deleting themselves. I put the slider option up to the highest it can go, play, and it's all fine. Then I exit and come back later. It's still fine. But I've been busy so I haven't been able to go on for a while but today is one of my free days. I was excited because I was nearing the end! But then the first loading screen that says "Play new game" greeted me instead of the "Continue" one.
Any suggestions? This is infuriating and is the 3rd time it's happened!
Have a look at the Shared Machinarium .sol Files
topic "Where players can retrieve all 24 game levels for WinXP/Vista/Win7 also Mac and Linux."
Follow the step by step directions to substitute your current (useless) saved game file with one of the pre-saved .sol files we've provided in the "Machinarium .sol Stash". You can then continue at or near the place where you left off before your saved games were wiped.