Had the same problem with the bursting rectangles. Tried everything, and the solution turned out to be to just delete the [bUFFERPOOLS] section from the FSX.CFG file. That's it; simply remove any reference to Buffer pools. The entry puts too much strain on the GPU especially in DX10. Voila no more busting rectangles. BTW there is no need to limit water effects or anything else. Just delete [bUFFERPOOLS] from your FSX. CFG.