Yes, PEP does allow for an unlimited number of pastetext items to be stored (I currently have about 75 items). What version of PEP are you using? The most current is .
When you enter a new item, are you sure you are clicking the "Save entry" and "Save changes and exit" buttons?

If you are still experiencing problems, let me know. There is a possibility your
pasteemailplus.json file is corrupt and needs to be rebuilt.