compare the following formulae with your favourite working bold math setup (confirmed with CM, Iwona, Lucida here): \startformula % this works \sin{\frac{{\bfm \pi}}{2}}=\sqrt{\bfm2} \stopformula \startformula % this doesn't \sin{\frac{{\bfm \pi}}{2}}=\sqrt{2} \stopformula % \startformula % this crashes % \sin{\frac{\bfm \pi}{2}}=\sqrt{2} % \stopformula I can't claim to know about all the family magic that goes on behind the scenes with bold math, but I'm fairly confident I can configure things properly. Smells like a bug. In other news, these will make bold numbers, if you need them: \definemathcharacter [48] [nothing] [mr] ["30] \definemathcharacter [49] [nothing] [mr] ["31] \definemathcharacter [50] [nothing] [mr] ["32] \definemathcharacter [51] [nothing] [mr] ["33] \definemathcharacter [52] [nothing] [mr] ["34] \definemathcharacter [53] [nothing] [mr] ["35] \definemathcharacter [54] [nothing] [mr] ["36] \definemathcharacter [55] [nothing] [mr] ["37] \definemathcharacter [56] [nothing] [mr] ["38] \definemathcharacter [57] [nothing] [mr] ["39] Again, checked on my limited test cases and knowledge of mathematics. I'm sure there will be unanticipated side effects. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Adam T. Lindsay, Computing Dept. atl@comp.lancs.ac.uk Lancaster University, InfoLab21 +44(0)1524/510.514 Lancaster, LA1 4WA, UK Fax:+44(0)1524/510.492 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-