When using a slave the ClearCase plugin fails if configured to use a snapshot view with update and "use the update .upt file for change log".

The plugin is looking on the master for the .upt file rather than the slave's workarea.
Each time the build was run, the update would complete and then I would receive a "Cannot find the path specified" Java error when the plugin attempted to read the .upt file.

I tested out copying the .upt file to the master node in the same location as it was created on the slave node by the plugin while it was updating, and when the plugin attempted to create the change log it succeeded because it was able to find the file on the master (the file I copied manaully to verify this was the problem).