• There is an issue with the "Dialog" object and Max ToolBox that can cause Max to crash.  It has been recommended by Cycling '74 on the forums to replace the dialog object by an abstraction using the "Text field" object because the "Dialog" object is not supported anymore.

• Objects created with the Command/Ctrl + number key combo won't appear at the cursor position with Max 4.5.3, you need to update to 4.5.4

• The distribute function works better with objects of the same size, optimizations might come for objects of different sizes.