GH does not correctly count estimate, remaining estimae and time worked

After switching from GH5.1 to GH5.2 estimate,remaining estimates and time worked are lost or counted incorrectly. Look at the attachments - for GH5.1(origtime.jpg) i have over 1000h remaining estimate, after switch (timewokred lost.jpg) - none... Same problem for original estimate and time worked

Workaround

Set a Start Date sufficiently older in the past, say 12 months, ensuring that statistics for your Versions are generated.