Hi ccaaee
Check /etc/fonts/ and see it the file fonts.conf exists. If it doesn't, make sure fontconfig.tcz
is installed. I also read somewhere that running fc-cache from the command line might help.
If that doesn't solve your problem, install strace.tcz and use that to trace what's happening.
strace rrdtool parameters
where parameters is what you might normally enter after rrdtool. Then check the output for
a line containing fonts.conf, that should provide a hint of what is wrong.