error with multi-line vertical ticklabels

I found that multi-line ticklabels work fine in normal (hortizontal) mode. However, after a set(t, 'rotation', 'vertical') the plot fails as shown below. The plot window pops up, then disappears.
System is RH linux 9, matplotlib 0.51, pygtk 2.0.0,

Are multi-line labels supported? In vertical mode too?

Thanks for your help.

  -Al Schapira, a.d.schapira@...107...

### This is based upon the "" in /examples.

[ads@...108... py]$ cat
from matplotlib.matlab import *

plot([1,2,3,4], [1,4,9,16])
set(gca(), 'xticks', [1,2,3,4])

t = set(gca(), 'xticklabels', ['Frogs\nOKAY 1', 'Hogs\nFine 2', Bogs\nGOOD 3', 'Slogs'])

set(t, 'rotation', 'vertical') # UNCOMMENT THIS to make the above fail


[ads@...108... py]$ python

The program '' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
   (Details: serial 1083 error_code 8 request_code 73 minor_code 0)
   (Note to programmers: normally, X errors are reported asynchronously;
    that is, you will receive the error a while after causing it.
    To debug your program, run it with the --sync command line
    option to change this behavior. You can then get a meaningful
    backtrace from your debugger if you break on the gdk_x_error() function.)