Same issue with kmail on karmic x64, when accessing IMAP folders. Appeared on upgrade to package version *ubuntu4. Downgrading kmail and dependent packages to *ubuntu3 makes it stable again.
dpkg -i libkleo4_4%3a4.3.1-0ubuntu3_amd64.deb libkdepim4_4%3a4.3.1-0ubuntu3_amd64.deb libkontactinterfaces4_4%3a4.3.1-0ubuntu3_amd64.deb libkpgp4_4%3a4.3.1-0ubuntu3_amd64.deb libksieve4_4%3a4.3.1-0ubuntu3_amd64.deb libmimelib4_4%3a4.3.1-0ubuntu3_amd64.deb kmail_4%3a4.3.1-0ubuntu3_amd64.deb
Same issue with kmail on karmic x64, when accessing IMAP folders. Appeared on upgrade to package version *ubuntu4. Downgrading kmail and dependent packages to *ubuntu3 makes it stable again.
dpkg -i libkleo4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb libkdepim4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb libkontactinter faces4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb libkpgp4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb libksieve4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb libmimelib4_ 4%3a4.3. 1-0ubuntu3_ amd64.deb kmail_4% 3a4.3.1- 0ubuntu3_ amd64.deb