misbehaviour of some tk windows, R 2.6.0 on SUSE 10.1?

I don't know whether this is specific to (my installation 
of) SUSE 10.1, or is more general.  

With R 2.6.0, I am finding that some widgets made through 
the tcltk package are having problems which become evident 
through scrollbar activity.  An example is demo(tkfaq) -- 
see below.  To reproduce the problem, I do the following: 
after the tk window appears, hold down the "scroll-down" 
tab at the foot of the window for a few seconds, then 
release.  If scrolling stops (as it should, if all is 
working correctly), do the same thing again.  Repeating 
this 2 or 3 times usually results in uncontrolled 
(unstoppable) scrolling activity; and closing the window 
when that happens delivers the errors that appear in the 
transcript below.

My R 2.6.0 was built on my own system,

OS:  SUSE linux 10.1
tcl: 8.4.12-14
tk:  8.4.12-14
gcc: 4.1.0-25

Since I had not seen this behaviour with previous versions 
of R, I did a check with R 2.5.1: a fresh build today of R 
2.5.1 on the same system does not appear to have the same 
problem.

Any ideas?  Is anyone else seeing this behaviour?

David
  

----------------------------------------
david at blackbox2:~> R --vanilla

R version 2.6.0 (2007-10-03)
Copyright (C) 2007 The R Foundation for Statistical 
Computing
ISBN 3-900051-07-0

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

  

sessionInfo()
    

R version 2.6.0 (2007-10-03) 
i686-pc-linux-gnu 

locale:
LC_CTYPE=en_GB.UTF-8;LC_NUMERIC=C;LC_TIME=en_GB.UTF-8;LC_COLLATE=en_GB.UTF-8;LC_MONETARY=en_GB.UTF-8;LC_MESSAGES=en_GB.UTF-8;LC_PAPER=en_GB.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_GB.UTF-8;LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  
methods   base     

loaded via a namespace (and not attached):
[1] rcompgen_0.1-15
  

library(tcltk)
    

Loading Tcl/Tk interface ... done
  

demo(tkfaq)
    

	demo(tkfaq)
	---- ~~~~~

Type  <Return>	 to start : 

  

require(tcltk) || stop("tcltk support is absent")
    

[1] TRUE

  

local({
    

+ 
+     tt <- tktoplevel()
+     tkwm.title(tt, "R FAQ")
+ #    Gave tiny font on some systems
+ #    txt <- tktext(tt, bg="white", font="courier")
+     txt <- tktext(tt, bg="white")
+     scr <- tkscrollbar(tt, repeatinterval=5,
+        .... [TRUNCATED] 
******************************************************
 The source for this demo can be found in the file:
 /home/david/lib/R/library/tcltk/demo/tkfaq.R 
******************************************************
  

Error in structure(.External("dotTclObjv", objv, PACKAGE 
    

= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.1".

Error in structure(.External("dotTclObjv", objv, PACKAGE 
= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.2".

Error in structure(.External("dotTclObjv", objv, PACKAGE 
= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.2".

Error in structure(.External("dotTclObjv", objv, PACKAGE 
= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.2".

Error in structure(.External("dotTclObjv", objv, PACKAGE 
= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.2".

Error in structure(.External("dotTclObjv", objv, PACKAGE 
= "tcltk"), class = "tclObj") : 
  [tcl] invalid command name ".1.2".