There is a problem with Speech Recognition 1.5 on PowerBooks running System 7.6. If Speakable Items is turned on, and the PowerBook computer is put to Sleep, the PowerBook may crash when it comes out of sleep. The crash may manifest itself as a freeze, a "Finder CHK error", a Type 10 error, or a Type 11 error.
This behavior only occurs if System 7.6 is installed; it does not occur with earlier versions of the system software. It has been reproduced on PowerBook 1400 and 5300 computers, but may also occur on other Speech Recognition-capable PowerBook computers.
This behavior is fixed in the Mac OS 7.6.1 Update which is available from the Apple Software Updates library.
These articles can help you locate the software update mentioned here:
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Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
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Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.