I get a mono error when I execute:
/Library/Frameworks/Mono.framework/Versions/Current/bin/mono ~/bin/Fiddler.exe
It gives an alert "mono quit unexpectedly", and an execution error and stacktrace:
WARNING: The Carbon driver has not been ported to 64bits, and very few parts of Windows.Forms will work properly, or at all
Stacktrace:
at <unknown> <0xffffffff>
at (wrapper managed-to-native) System.Windows.Forms.XplatUICarbon.CGDisplayBounds (intptr) [0x00002] in <36fbc38531724d82b10aef6ebafea6e9>:0
[...]