I switched to using SVN builds (from previously using 1.3beta3) when I noticed msn-pecan had been added instead of the default libpurple msn plugin. Since then, when I first logged in, all my cached msn user icons did not display. I initially thought there was some problem with them not working at all, but after a number of minutes, one of my buddies icon's finally displayed. A long while later, another one updated, going on in this fashion for hours. Eventually, most were displayed, but there are several that just simply do not show their user icon no matter how long it is left.
They all worked fine in 1.3beta3. Currently using revision 24087.