Subversion server interaction is broken for me on Linux. Whenever I do something that requires the SVN integration to talk to the server (update, commit), I'm prompted for my credentials. Once I've done so, the dialog immediately re-appears (with its title suggesting that authentication has failed). It does not matter whether or not I check "Save credentials", and the credentials I do enter are definitely correct.
The only way to get out of the credentials request loop is to hit "Cancel", which then leads to an "Error: svn: authentication cancelled" message (as expected).
The (remote) SVN server in question is v1.2.0. The upgrade option in IDEA's SVN configuration has been set to "Upgrade automatically". I've tried using both the system default and a custom Subversion configuration directory, and I've also removed Subversion's default ("~/.subversion") configuration directory to rule out its contents as a cause.
SVN access works as expected with the very same work directory on the command line (using a v1.4.4 client). The work directory is in v1.4 format, I believe (".svn/format" says "8").