wrong header in mark-entry temp

I'm currently getting an error in my application, can anyone decipher
the output below?  (I noticed that Nico de Jager mentioned a similar
issue several month ago.)  

This is on LispWorks 5.0.2 running on an Intel Mac.

<**>wrong header in mark-entry temp =22d54281,cur-field =228564f8 object =228564f0 header =6b2067a2
;>>>>> dumping  228564f0  [1]
;> 228564f0:  82018096 2000558b 22d5424a 82008096
;>>>>> dumping  228564e8  [5]
;> 228564e8:  228564d9       56 82018096 2000558b
;> 228564f8:  22d5424a 82008096 228564f1       56
;> 22856508:  82008096 228564fd       56 8200807e
;> 22856518:         8 214fbcf3        4 8200807e
;> 22856528:         8 214fbcf3       18 8200807e
;>>>>> dumping  22d54271  [5]
;> 22d54271:  56200040 c4000000 3622d542 cb2067a4
;> 22d54281:  6b2067a2  42003d7 90000000 c322d542
;> 22d54291:  5620959b f8000000 4522d542 a3217737
;> 22d542a1:  56217737 bb000000  3217737 56200040
;> 22d542b1:  bb000000  b217737 8622cd74 9800000c

Cheers,
Chris Dean