I am using the Titanium Client too, and I also noticed this, so it isn't anything about the client, and it's not only in SolB, but the problem sure happens in SolB
Example of other day in SolB:
1. time /who lfg 40 50 all -- turned up a whole bunch of people .. 20+
2. time /who lfg 40 50 all (10 sec. later) turned up 2 people.

there is some odities happening if you include classes in the command and depending wich order you put the variables it also turns out different, or don't work at all.

Will try if i can some ss's of it

Failing right now. I'm in solb doing / all kedge and getting nothing, yet I hae people on my friends list that show up in that zone.

the / all lfg 20 30 or whatever range you give sometimes does this to me as well. I wait a few seconds, then hit shift+up and resend the command it it'll fix itself. usually. sometimes it takes another try or two.

Titanium.

still wonder if the order you put the parameters in matters .. eg /who all 30 40 vs /who 30 40 all

The order matters not at all. I have had /who all lfg 35 50 both work and not work, and i've had /who lfg 35 50 all both work and not work. As far as reproducibility, well, no. I can't reproduce it consistently. When it doesn't work, it doesn't work. After a while it just works again. It doesn't matter if you zone or whatever, it just will eventually randomly start working again. And then stop working again.