The problem has been discussed before.
In short, the screws they used had a flange that would tighthen the lexan to the block by applying pressure from the top. This has since been replace with hex bolts, that screw right into the lexan, and come flush with the lexan. In other words, the screws now hold the lexan down from a groove in the middle.
This was done to prevent the cracking of the lexan, as the top pressure tended to spread cracks around.
Either way, the cracks didn't affect performance, and did not cause any leaks. It just looked bad, that's all, and since it's a clear top, it needs to look good (right?). It was strictly a esthetic problem/fix.
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