Hello everyone,
After a long and persistence investigation we managed to find out and correct the part of the scenery that causes the purple tiles issue. However, we are not in a position to fully determine why it does not affect all users but very few (according to the reports we receive). The new version will be shortly available as a free update, along with some other minor corrections. This version according to our tests will also significantly reduce or even eliminate some stutter reported by other users.
I would very much like to thank @slicker55 for his contribution to the above investigation and solution. Being one of the first customers reporting the issue, he kindly volunteered to test all the "new versions" (maybe more than 30) until the solution came up.
Regards,
Emmanuel
29Palms