Aha, that was the clue.
Just upgraded JDK to latest version, reinstalled and all is working okay again. Many thanks for your help. Tim From: Geertjan Wielenga <geertjan.wiele...@googlemail.com.INVALID> Sent: 11 September 2022 12:11 To: Tim West <timw...@milltech.co.uk> Cc: users@netbeans.apache.org Subject: Re: Version 15 won't start What version of the JDK are you using? Gj On Sun, 11 Sep 2022 at 13:10, Tim West <timw...@milltech.co.uk <mailto:timw...@milltech.co.uk> > wrote: Hi, I've been using Netbeans 12.6 for some while and today installed 15 however, although the splash screen shows modules loading etc when the main program interface opens it is blank and becomes unresponsive. Any ideas how I go about getting version 15 running? Many thanks