Hi, I'm on Lubuntu 13.10 (beta 2), and I've just upgraded every basic thing to the latest, including pcmanfm, now at v18.104.22.168.
Unfortunately there might have been one update I shouldn't have done, and that was this.
On my vanilla installation, pcmanfm has worked PERFECTLY, popping up a dialog box asking me for a password to mount my NTFS partitions (bit annoying, but it's OK).
Now, nothing is mounted anymore. And when I click from partition to partition, I get the error message "An operation is already pending" but nothing is mounted. Everything is just stalled.
Once it happened that the error message window didn't close anymore despite clicking a zillion times, and I had to restart X. Argh!!
Unfortunately there is no way to see what pcmanfm is doing. Whilst KDE and some GNOME applications are widely known to write everything nonsensical to terminal (GTK warning blah blah blah), pcmanfm doesn't give any output at all.
So how can you figure out what's wrong?