SetPixelFormat broken in 0.9.54

[bill lam]

I run a opengl script that worked in 0.9.53 but crashed in 0.9.54 (and 0.9.55)
I traced it failed at this line
   SetPixelFormat hdc;pixfmt;pfd

with the following message in console:

X Error of failed request:  BadAccess (attempt to access private resource denied)
   Major opcode of failed request:  160 (Composite)
   Minor opcode of failed request:  1 ()
   Serial number of failed request:  164
   Current serial number in output stream:  182

Is this a known issue?

ubuntu 7.10 amd64

regards,