log file:

2010-06-16 21:11:14.992 enigmail.js: Logging debug output to /tmp/enigdbug.txt
2010-06-16 21:11:14.992 enigmail.js: Enigmail version 1.0.1
2010-06-16 21:11:14.992 enigmail.js: OS/CPU=Linux x86_64
2010-06-16 21:11:14.992 enigmail.js: Platform=X11
2010-06-16 21:11:14.992 enigmail.js: composeSecure=true
2010-06-16 21:11:14.993 enigmail.js: Enigmail.initialize: gEnvList = DISPLAY=:0.0,HOME=/home/twerner,LANG=de_DE.UTF-8,LOGNAME=twerner,LD_LIBRARY_PATH=/usr/lib/icedove:/usr/lib/icedove/plugins:/usr/lib/icedove,MOZILLA_FIVE_HOME=/usr/lib/icedove,PATH=/usr/local/bin:/usr/bin:/bin:/usr/games,PWD=/home/twerner,SHELL=/bin/bash,USER=twerner
2010-06-16 21:11:14.993 enigmail.js: ResolvePath: filePath=gpg
2010-06-16 21:11:14.993 EnigmailAgentPath=/usr/bin/gpg

2010-06-16 21:11:15.009 enigmail> /usr/bin/gpg --version --version --batch --no-tty --charset utf8
2010-06-16 21:11:15.009 gpg (GnuPG) 1.4.10
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: ~/.gnupg
Unterstützte Verfahren:
Öff. Schlüssel: RSA, RSA-E, RSA-S, ELG-E, DSA
Verschlü.: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128, 
            CAMELLIA192, CAMELLIA256
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Komprimierung: nicht komprimiert, ZIP, ZLIB, BZIP2

2010-06-16 21:11:15.009 enigmail.js: detected GnuPG version '1.4.10'
2010-06-16 21:11:15.009 enigmail.js: detectGpgAgent
2010-06-16 21:11:15.009 enigmail.js: detectGpgAgent: no GPG_AGENT_INFO variable set
2010-06-16 21:11:15.009 enigmail.js: detectGpgAgent - gpg 1.x found
2010-06-16 21:11:15.009 enigmail.js: detectGpgAgent: GPG_AGENT_INFO=''
2010-06-16 21:11:15.010 enigmail.js: Enigmail.stillActive: 
2010-06-16 21:11:15.010 enigmail.js: Enigmail.initialize: END
2010-06-16 21:11:15.010 enigmailMessengerOverlay.js: enigMessageDecryptCb:
2010-06-16 21:11:15.010 enigmailMessengerOverlay.js: content-type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-vNdlhUF6f6mVHdJAeW0l"
2010-06-16 21:11:15.010 enigmailMessengerOverlay.js: content-transfer-encoding: 
2010-06-16 21:11:15.010 enigmailMessengerOverlay.js: x-enigmail-version: 
2010-06-16 21:11:15.011 enigmailMessengerOverlay.js: multipart/signed
2010-06-16 21:11:16.115 enigmailMessengerOverlay.js: enigUpdateOptionsDisplay: 
2010-06-16 21:11:16.116 enigmailCommon.js: EnigCollapseAdvanced: test
2010-06-16 21:11:17.295 enigmailMessengerOverlay.js: enigUpdateOptionsDisplay: 
2010-06-16 21:11:17.295 enigmailCommon.js: EnigCollapseAdvanced: test
2010-06-16 21:11:18.605 enigmailCommon.js: EnigViewConsole
2010-06-16 21:11:18.717 enigmailConsole.js: enigRefreshConsole(): hasNewData
2010-06-16 21:11:18.717 enigmailCommon.js: EnigGetFrame: name=contentFrame
2010-06-16 21:11:22.894 enigmailConsole.js: enigConsoleUnload
2010-06-16 21:11:23.795 enigmailMessengerOverlay.js: enigUpdateOptionsDisplay: 
2010-06-16 21:11:23.797 enigmailCommon.js: EnigCollapseAdvanced: test
2010-06-16 21:11:24.502 enigmailMessengerOverlay.js: enigUpdateOptionsDisplay: 
2010-06-16 21:11:24.502 enigmailCommon.js: EnigCollapseAdvanced: test
2010-06-16 21:11:25.525 enigmailCommon.js: EnigViewDebugLog

nothing in error console

(that is for Debian's enigmail 2:1.0.1-2)