SQL Developer problem. Rows without columns on data tab

Hello,
I have a strange behavior in Oracle SQL Developer Version 2.1.0.63. When I'm trying to open the "Data tab" for some tables, SQL Developer shows data rows but without columns! It seems that I can select different rows but I can't see neither any data nor column names.
Under the filter setting there are no available columns either.
At the same time, when I'm trying to open sys tables they are displayed normally.
From the other side, those tables which are not displayed correctly in 2.1.0.63, could be opened in Version 1.5.5 without any problems.
Do you have any ideas?
Thanks in advance.

Hi,
Refer to the SQL Developer forum: SQL Developer for SQL Developer related questions

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