There were come configuration changes made in v1.19 that has changed the default location for the embedded Derby database. Can you delete your Job and re-create it to see if that resolves the polling issue?
With PTC plugin v1.20 I have disabled the current build job and create then new one based on the config of disabled and started build of new job manually.
After that new job was started by an SCM change after each polling interval again, the same as original job.
Polling log shows
Polling Log
This page captures the polling log that triggered this build.
Started on Jan 10, 2014 5:06:37 PM
Preparing to execute si projectinfo for /repository/CorporateMeasurementTechnologies/SWProduction/Tools/BuildProcess/JenkinsMSEI/GetBuildResults/project.pj
Preparing to execute si viewproject for /repository/CorporateMeasurementTechnologies/SWProduction/Tools/BuildProcess/JenkinsMSEI/GetBuildResults/project.pj
Project contains changes a total of 59 changes!
Done. Took 39 sec
Changes found
By the way, it is not clear what that 59 changes are! It is not file changes!
There were come configuration changes made in v1.19 that has changed the default location for the embedded Derby database. Can you delete your Job and re-create it to see if that resolves the polling issue?