If you're trying to use a Sierra AirCard 597E on OS X 10.5 Leopard via the bundled Sierra Wireless Watcher Lite software, then you're probably frustrated like me.
Since my original review, Sierra did release a new version 1.1.3 of the beleaguered PowerPC binary (no it's not Universal/Intel-native). While the new version starts less slowly than 1.1.1, it still mysteriously crashes, sometimes taking the connection with it.
The fix? Simply use Apple's built-in modem dialer, leaving Watcher Lite dormant unless its device provisioning or activation functions are required.
Step 1: In the Network Preferences Panel, check "Show modem status in menu bar"
Step 2: Enjoy the nicely integrated, crash-free EV-DO connectivity
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