xmaxima error on launch and crash on file read

[goldenberg@…]

When I launch xmaxima, I see the following error:

2008-01-02 14:00:35.967 Wish Shell[6594] CFLog (21): Error loading /System/Library/ScriptingAdditions/Digital Hub Scripting.osax/Contents/MacOS/Digital Hub Scripting:  error code 4, error number 0 (Symbol not found: __cg_png_destroy_write_struct
  Referenced from: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /usr/local/lib/libPng.dylib
)

Maxima functions fine, until I try to use the batch command in the file menu, when the Wish shell crashes. Here is a report from the Apple crash reporter:

Date/Time:      2008-01-02 14:01:34.605 -0700
OS Version:     10.4.11 (Build 8S165)
Report Version: 4

Command: Wish Shell
Path:    /usr/bin/../../System/Library/Frameworks/Tk.framework/Versions/8.4/Resources/Wish Shell.app/Contents/MacOS/Wish Shell
Parent:  sh [6592]

Version:        8.4.7 (8.4.7)
Build Version:  100
Project Name:   tcl
Source Version: 200000

PID:    6594
Thread: Unknown

Link (dyld) error:

Symbol not found: __cg_png_create_read_struct
  Referenced from: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /usr/local/lib/libPng.dylib

Model: PowerMac7,3, BootROM 5.2.4f1, 2 processors, PowerPC G5  (3.0), 2 GHz, 1.5 GB
Graphics: ATI Radeon 9600, ATY,RV351, AGP, 128 MB
Memory Module: DIMM0/J11, 256 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM1/J12, 256 MB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM2/J13, 512 MB, DDR SDRAM, PC3200U-25330
Memory Module: DIMM3/J14, 512 MB, DDR SDRAM, PC3200U-25330
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: Maxtor 6B160M0, 152.67 GB
Parallel ATA Device: PIONEER DVD-RW  DVR-109
USB Device: Hub, Up to 12 Mb/sec, 500 mA
USB Device: Hub, Up to 12 Mb/sec, 500 mA
USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 500 mA
USB Device: USB Optical Mouse, Logitech, Up to 1.5 Mb/sec, 100 mA
USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA
USB Device: Studio Display, Up to 1.5 Mb/sec, 500 mA
FireWire Device: LaCie d2 Extreme LUN 0, LaCie Group SA, Up to 800 Mb/sec

Thanks very much, David P. Goldenberg goldenberg@…