Firstly, if you're not using at least v3.12 of PT3, please update.
Download pagePT3 Build History / Release NotesI doubt that is the issue, but you will need to be up to date.
That error more likely indicates a problem with one of the files which makes up the database.
Try using the ReIndex option under Database > Housekeeping, along with the defaults, and see if that helps.
The second reason for this error is a result of faulty hardware. You can set PostgreSQL to ignore these errors by clicking Start --> Programs --> PostgreSQL --> Configuration Files --> Edit postgresql.conf. In the configuration file that appears, go to the bottom of the file and add the text “zero_damaged_pages = on” on a new line and then save and close the file. Click Start --> Programs --> PostgreSQL --> Reload Configuration and PostgreSQL will ignore the damaged data.