Hi,
I installed lyx 1.3.0 with cygwin yesterday and encountered the math symbol
rendering problem (the integral seen as R etc. on lyx) . I tried many
things, and finally made it work correctly after deleting/renaming the
strange looking "fonts.dir" and "fonts.scale" files under
C:\Myfiles\.lyx\xfonts [note that C:\Myfiles is the prefix of the HOME
directory[C:\Myfiles\Lyx] specified in the second line of lyxprofile file].
I hope this message may be helpful for anyone having the same problem.
Regards,