8 color bits and gtk1.2.10

[Carlos Pereira <carlos pehoe civil ist utl pt>]

I get this message when running my app on 8 color bits:

Gdk-ERROR **: BadAccess (attempt to access private resource denied)
  serial 3785 error_code 10 request_code 88 minor_code 0
Gdk-ERROR **: BadAccess (attempt to access private resource denied)
  serial 3786 error_code 10 request_code 88 minor_code 0

This is with gtk1.2.10, I am pretty sure this message
didn't show up with older (1.2.3) versions of gtk.

Moreover, pressing a button in one of my dialogs,
sometimes changes the look of several unrelated 
frame widgets (the frame shadow line becomes white)
This only happens with 8 bits, on this good old
Intel PC running Red Hat Linux 5.2 with XFree 3.*.

Could someone offer an explanation for this?

I am trying to make my app more user friendly 
for partly supported graphic cards and old hadware,
(Mmmh, did I say my G4 Powerbook running Yellow Dog 
Linux 2.2 is currently working only on 8-16 bits...)

Thanks for answering,

Carlos