I know the Zend Optimizer and Server Debugger aren't compatible with the 5.1.x series yet.
Luckly, the Zend Optimizer is free, but I don't think the server debugger is (comes with Zend Studio). My support subscription just ran out and I'm using Zend Studio 4.0 so I'm not elgible if they release an update to support 4.x. Is there a compatible, free version of the php remote debugger that would be compatible with the Studio Client IDE?
Thanks,
a9