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 PEP 4.1
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.