Hello,
I have finally come to the conclusion that the problem was introduced between
January 30th and February 1st, somewhere in libc_r.
When I replace, on a latest -CURRENT world and kernel, /usr/lib/libc_r.so.4 by
an older version dating from 01/30, the hangs disappear.
By the way, I have just noticed that the Linux version of Opera works perfectly
well on latest -CURRENT. Actually, unlike the FreeBSD one I have been using,
it is not linked against libc_r.
I wish I had been able to provide a patch to correct this problem, but this is
well beyond my abilities.
Regards,
Laurent