Comment 16 for bug 192218

got this problem too:
$ rdesktop -m -a 8 -g 900x550 -z -P -u Administrator 127.0.0.1

stop in middle with
X Error of failed request: BadValue (integer parameter out of range for operation)
  Major opcode of failed request: 53 (X_CreatePixmap)
  Value in failed request: 0x0
  Serial number of failed request: 1780947
  Current serial number in output stream: 1781145

with Ubuntu 12.04 (liveusb) and 1.7.0-1ubuntu2