Those running MW on Mac OSX have a problem, as the php version shipped with XCode is still 5.3.1, which doesn't work with MW > 1.14. With the entropy php no longer being updated AFAIK, this means that Mac-based sites need to use something like MacPorts, compile from source (which is apparently nontrivial due to other Apple-specific issues) or stay with 1.14 or earlier until Apple updates php via Software Update.
For what it's worth, I spoke to an Apple rep yesterday, who told me that Apple is aware of the problem, is working deploying php 5.3.3, and that they heard a lot of complaints about php based on problems with MW. He thought there would be an update "soon", after they finish their testing. So, I'm going to take the wait for a software update approach for now (I would have used entropy php if it was still being updated). The other interesting thing he told me is that issues get moved up Apple's priorities based on the number of tickets from Applecare. I would not have thought about complaining about XCode php on Applecare, but he assured me that that's the best way to make the wheel squeakier.
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Jim Hu
Associate Professor
Dept. of Biochemistry and Biophysics
2128 TAMU
Texas A&M Univ.
College Station, TX 77843-2128
979-862-4054