I'm using FontLab 5.0.2 at OS X 10.7.2 (MacBook) and the fonts that I generated with them don't works at OS X 10.5.8 (MacBook Pro) . This newest version of OS try to validate the .ttf archives and tells me that 'serious errors' were found. The system only links the error with the file, without further explanation. Thus, I can't install my new fonts on my new computer. On the other hand, I'm using the same fonts in the older system without any problem. What's happening? How can I solve this?