# on a Mac, you may find a stream of the following error messages in the console window: <code>Jan 31 14:35:17 xdsgui[20939] <Error>: Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem. Jan 31 14:35:17 xdsgui[20939] <Error>: If you want to see the backtrace, please set CG_NUMERICS_SHOW_BACKTRACE environmental variable.</code> This sounds terrible, but is actually harmless. Since it is a message from Qt (which XDSGUI uses for graphics), ''it does not compromise the XDS data processing in any way''. Just suppress the printout of these messages, by <code>xdsgui 2>&1 | egrep -v 'CoreGraphics|CG_NUMERICS'</code> | # on a Mac, you may find a stream of the following error messages in the console window: <code>Jan 31 14:35:17 xdsgui[20939] <Error>: Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem. Jan 31 14:35:17 xdsgui[20939] <Error>: If you want to see the backtrace, please set CG_NUMERICS_SHOW_BACKTRACE environmental variable.</code> This sounds terrible, but is actually harmless. Since it is a message from Qt (which XDSGUI uses for graphics), ''it does not compromise the XDS data processing in any way''. Just suppress the printout of these messages, by <code>xdsgui 2>&1 | egrep -v 'CoreGraphics|CG_NUMERICS'</code> |