Thanks for the response. I use JDK 14, perhaps that might be the reason. 

    On Thursday, May 28, 2020, 10:23:01 PM GMT+4:30, Peter Steele 
<steeleh...@gmail.com> wrote:  
 
 I had this, it seems to be to do with the jdk version. I had jdk 11 working 
fine but jdk 13 having the issue.
On Thu, 28 May 2020, 17:02 HRH, <hrh...@yahoo.com.invalid> wrote:

Hi,
Today, I noticed that the line numbers in the source code pane of the IDE 
suddenly had disappeared, even though View->Show Line numbers were checked. 
Closed and re-opened the source, the line numbering re-appeared. There might be 
an intermittent bug somewhere in NB 12 Beta 4. As I reported yesterday, the 
spell-checking functionality does not prompt correct spelling either (I thought 
Alt+Enter was supposed to prompt suggested correct spellings).
Thanks

  

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