Impossible to delete characters on the SQL worksheet

I am facing a noisy problem with SQL Developer (Versioning Support 1.5.5.59.69)...
Whenever I open a SQL worksheet, I can insert characters but I can't remove them...

What happened!

Hello
There is too much of a week, I had problem with strikes in the worksheets. For me has been useful tools-> preferences-> accelerators-> load Preset...
This returned value hit in the normal state.
Petr

Tags: Database

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    What is your question has to do with Sql Developer?

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    the Japan Government says:

    Hi Jeff

    I expect that it runs the import at least.

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