wrong header in mark-entry

Hi

Sometimes, after exiting LispWorks I get the following in the console from 
which I launched LispWorks. I can't reliably reproduce it, I can follow the 
same sequence of steps (e.g. loading an asdf library and exit) and I will 
only get the dump occasionally.

I am using LispWorks for Linux 5.0.1 Professional on Ubuntu 6.10 Edgy (kernel 
2.6.17-11-generic #2 SMP).

Has anyone seen this?

Thanks.
Nico

CL-USER 1 >
Warning: (Xt Warning) Actions not found: TextInputPaneCompleteText<**>
wrong header in mark-entry temp =21ace16c,cur-field =216db5cc object =216db5c4 
header =16
;>>>>> dumping  216db5c4  [1]
;> 216db5c4:  82018096 216db5b9 21ace16d 82008096
;>>>>> dumping  216db5bc  [5]
;> 216db5bc:  216db5ad       56 82018096 216db5b9
;> 216db5cc:  21ace16d 82008096 201801a3       26
;> 216db5dc:  82008096 216db5d1 216db541 82008096
;> 216db5ec:  2016ba1b 216daec5 82008096 216db5e9
;> 216db5fc:  216dad8d 82008096 2143087f 21667ba7
;>>>>> dumping  21ace15c  [5]
;> 21ace15c:  21bb54ab 21ba2cb7 21ace194 2064c9a8
;> 21ace16c:        16 21ace2c0 21ace194 2064c9a8
;> 21ace17c:  2064c9c2 20139303       56 21ace1a0
;> 21ace18c:  20004003       56 21ace1e0 2064cd7e
;> 21ace19c:  2064cc13 2003d77b        4 21ace1ac
<**>wrong header in mark-entry temp =21acdaec,cur-field =217627e8 object 
=217627e0 header =21792beb
;>>>>> dumping  217627e0  [1]
;> 217627e0:  82018096        4 21acdaef 82008096
;>>>>> dumping  217627d8  [5]
;> 217627d8:  217627c9       56 82018096        4
;> 217627e8:  21acdaef 82008096 217627e1 217627d5
;> 217627f8:  82008096 20cc1c27  400001c 82008096
;> 21762808:  20cc40b7  4000004 82008096 20cc24e7
;> 21762818:   7ffa014 82008096 217627f9 21762829
;>>>>> dumping  21acdadc  [5]
;> 21acdadc:  2024b445 21792beb 2084dd5b 2024b445
;> 21acdaec:  21792beb 2084dd47       56 21acdb2c
;> 21acdafc:  2011dcf7       96        0 2011dc6f
;> 21acdb0c:  2011657e        4 2011dc92 2003d77b
;> 21acdb1c:        56 21acdbf8 20004003 20838877