After pressing the "save changes" button the page loads for a while and it appears the following message:
Speichern fehlgeschlagen: AJAX call failed: parsererror - SyntaxError: JSON.parse: unexpected character. Try again while holding down the “Shift” key.
Even holding down the “Shift” key does not work :-(
My table has 826 rows and 3 columns. In one of the three columns every row is filled with a html-code like
P.S.: Sorry for my bad english I'm German