The Subversion 1.7 and 1.8 clients use different working copy formats, and can neither read nor write working copies from other versions.
The Subversion 1.8 client can however upgrade an existing working copy to the 1.8 format.
The posts to the mailing list are archived and could already contain the answer to your question as part of an older thread.
When creating a new issue, please provide a comprehensive description of your concern.
If you switch client versions within Eclipse (under Team -If you are running Mac OS X 10.9.x and have installed the command-line tools from Xcode version 5.0 (both current as of 2014-03-20) then this will provide a Subversion 1.7.x client.
The Mac Ports system installs a Subversion 1.8.x client.
Each of these areas can afflict different amounts of pain to different developers, based on how long you’ve used the installation for, your type and number of projects.
Let’s go through each one individually and show you how you can fix them. This might seem obvious, but Java applications are rarely tuned with reasonable Java memory settings from the outset and you’d be well advised to change yours to reduce constant heap expansion which really slows general startup and running down.