Ligature brackets missing

[John Wiedenhoeft]

Hi all,

using LP 2.7.27, ligature brackets don't show up in the pdf anymore.
Here is an excerpt of the log (it's going on that way):

57v-1_voce_jhesus_amabili.ly:44:44: warning: Ignoring grob for slur.
avoid-slur not set?
                                c4.(~ \[c16
                                            b! a4)\]

Any ideas? I found only one entry for avoid-slur, which is a bit cryptic
for me.

Could anybody help please,

Thanx,
John