weird bugs, memory manager bugs?

I´ve now added debug parameters to dozens of functions and I had to insert some "bug" fixes to fix PHPs current buggy behaviour in relation to 4.0.1pl2, I had not only to initialize arrays, I had to initialize intergers too and now I´ve reached a point, where I am sure that there´s something badly wrong. I´ve just revealed that a variable $o_name, which contains string, only strings - contains an array, but that´s not enough, it contains an array with values of a completely different object-property, what has nothing to do with the current object I am in. Have there been some "optimization" on the memory manager after 4.0.1pl2 which could lead to a) unitialized variables b) changed variables Note: I´m using zeevs debug build, not mine. If I use my release builds I get similar errors at other points (I have to initialize variables there too then), but it all ends up in an exception. That´s the most weird and most worse bug I´ve ever had. I´ve attached another backtrace which led to a crash, but apparently has nothing to do with the situation. andré