plotdf error



After upgrading to Maxima 5.11.0 (the latest version in debian unstable)
I can load plotdf successfully but when trying to run plotdf I get a
dialog box with:

Documentation not found in '/usr/share/maxima/5.9.1' 

Answering OK I get another dialog box with:

Starting documentation not found in
'/usr/share/maxima/5.9.1/xmaxima/intro.html' 

Answering OK I get:

(%i5) plotdf(x);
Error in startup script: not supported dirname
    while executing
"error "not supported [lindex $res 0]""
    ("default" arm line 3)
    invoked from within
"switch [assoc type $res] {
        http {
            #mike FIXME: replace with http get
            # puts $res
            # puts "socket [assoc server $res] [assoc port $res 8..."
    (procedure "getURL" line 14)
    invoked from within
"getURL $new contentType mimeheader $post"
    (procedure "OpenMathOpenUrl" line 62)
    invoked from within
"OpenMathOpenUrl $maxima_priv(firstUrl) -toplevel .browser"
    (procedure "MAXGui:install" line 33)
    invoked from within
"MAXGui:install gui .maxima"
    ("uplevel" body line 1)
    invoked from within
"uplevel [concat $object(__class__):$method gui $args]"
    (procedure "gui" line 3)
    invoked from within
"gui install $fr"
    (procedure "MAXTkmaxima:install" line 22)
    invoked from within
"MAXTkmaxima:install tkmaxima"
    ("uplevel" body line 1)
    invoked from within
"uplevel [concat $object(__class__):$method tkmaxima $args]"
    (procedure "tkmaxima" line 3)
    invoked from within
"tkmaxima install"
    (file "/usr/bin/xmaxima" line 15072)
(%o5)                                  1

Any suggestions as to how to fix this?

Thanks, Bob
-- 
Dr. Robert J. Jerrard, Professor of Mathematics,
Concordia University College of Alberta,
7128 Ada Blvd., Edmonton, Alberta, T5B 4E4, Canada.
Phone: (780) 479-9291, Fax: (780) 474-1933.