good app but bad support and customer care

app works as is. however i made in-apps purchases for all three feasures (unlimited tray, 16 bit colour and exif copyright tag). the app works for a while and today it stops working, allowing me to watermark only 5 at a time. this is the default for the free version. email sent to the developers never got acknowledged.

1saac about watermark PRO, v1.6.5