Hi!Here is a proposal to fix the crash when you try to define macros with self references, i.e. by using \foo inside of the definition of \foo itself (or by any other definitional loop):
http://bugzilla.lyx.org/attachment.cgi?id=1548&action=viewIt basically implements a locking counter in MacroData which is increased before drawing an expanded macro and decreased afterwards. Moreover inside of the arguments of the macro the counter is temporarily decreased as those cases do not count as a loop. Any self reference is rendered as "Self reference: foo". Maybe not the most elegant solution, but it does the job until another clean implementation of the macros is available.
Schimmi
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