Hello,
I noticed the following bug, using GNU LilyPond 2.4.2 (the Debian
package) Version: 2.4.2-1
with Package: ec-fonts-mftraced Version: 1.0.7-1
Going back to my printed score, I also had it with version 2.3.22
Consider a score with instuments having different key signatures. One
instrument is in D, the others in C. The spacing between the two sharps
of the key signature and the first note of the line is too small (not
to say inexistant). This only happens at the beginning of a line where
there is no time signature. It also seem to happen only when the other
instuments are in C (that is, nothing in the key signature).