The Cool Release Windlight viewer crashes with voice enabled when connecting to non voice land. I've totally tested it and will provide a log of the reproducable crash. I've also tested with your stable, patched viewer and it does not crash. The stock Linden Windlight does not crash as well, thus, I've left the bug report for you.
As long as I hopefully have your attention, could you please add a mouselook button on the HUD for the next release? Thank you for the addition of MU* style emotes.
Backtrack of console output follows:
2008-04-08T11:54:26Z INFO: BaseCapabilitiesComplete::result got capability for ViewerStats
2008-04-08T11:54:26Z INFO: LLVoiceClientCapResponder::result got parcel_local_id
2008-04-08T11:54:26Z INFO: LLVoiceClientCapResponder::result got region_name
2008-04-08T11:54:26Z INFO: LLVoiceClientCapResponder::result got voice_credentials
2008-04-08T11:54:26Z INFO: LLVoiceClient:

2008-04-08T11:54:26Z INFO: LLVoiceClient:

2008-04-08T11:54:26Z INFO: LLVoiceClient:

2008-04-08T11:54:26Z INFO: LLVoiceClient::notifyStatusObservers: UNKNOWN, session URI
2008-04-08T11:54:26Z i686-linux-client-releasefordownload/llui/llpanel.cpp(739) : error
2008-04-08T11:54:26Z ERROR: getUIString: Failed to find string unavailable in panel chat floater
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
LogLock::LogLock: failed to get mutex for log
./secondlife: line 111: 17571 Segmentation fault (core dumped) LD_LIBRARY_PATH="`pwd`"/lib:"`pwd`"/app_settings/mozilla-runtime-linux-i686:"${LD_LIBRARY_PATH}" $LL_WRAPPER bin/do-not-directly-run-secondlife-bin -settings settings_coolslviewer_rc.xml -channel "Cool SL Viewer RC"
*** Unclean shutdown. ***
./secondlife: line 119: arch: command not found
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Please see README-linux.txt before reporting problems.