PID=0 in tx_yag_domain_model_gallery

[woepwoep]

For some reason, while it used to work correctly, now when i add a gallery, in phpmyadmin i see pid=0 where the YAG folder has pid=98. Also the gallery is not presented (obviously). When in phpmyadmin i change pid=0 to pid=98 , the new gallery appears.

What could this be?
TYPO3 v7.6.18
YAG v4.2.1

Thx Ron

[woepwoep]

Update: the same behaviour (pid=0 instead of pid=98) in tx_yag_domain_model_album,
and also in tx_yag_domain_model_item.

constants settings:
plugin.tx_ptextbase.persistence.storagePid = 98
config.yag.addjQuery = 0
config.yag.addjQueryUi = 0