JStorage does not give an indication it has run out of storage.

[rlloyd2001]

jStorage/jstorage.js

Lines 459 to 470 in 5f4075a

	function _save() {
	_dropOldEvents(); // remove expired events
	try {
	_storage_service.jStorage = JSON.stringify(_storage);
	// If userData is used as the storage engine, additional
	if (_storage_elm) {
	_storage_elm.setAttribute('jStorage', _storage_service.jStorage);
	_storage_elm.save('jStorage');
	}
	_storage_size = _storage_service.jStorage ? String(_storage_service.jStorage).length : 0;
	} catch (E7) { /* probably cache is full, nothing is saved this way*/ }
	}

Looking at this code, if JStorage runs out of room, it will assume IE7 and kill the exception. This should be changed to at least display a warning in the console that JStorage was unable to save because local storage is full. This would save a lot of time.