Charts empty after upgrade to snapshot Build #548

Hello all,

I had a working setup with lot of items, some of them are temperature values for different rooms. Another chart is for humidity (single chart). After upgrading to Build #548 all my charts are empty, no values are shown. The chart itself is being shown, but no curves.
Did I something wrong? I use mysql persistance, the database is fine and the items timeseries is also fine.

best regards

Btw: I restored an older installation with build #502 and put my configuration there and charting works. So I’m quite sure that this is an issue.