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1. Delete userdir & cachedir 2. Goto Tools->Options->Editor->Code Completion and choose Language:Java (or any Language other than "all languages") 2. Click the Help Button. 3. Close the Help Window. 4. Click OK to close Options. 5. Repeat steps #2 through #3. Result: Help does not open. Expected: Help opens. Workaround: Restart NetBeans. Product Version: NetBeans IDE 8.1 Beta (Build 201507231027) Java: 1.8.0_51; Java HotSpot(TM) 64-Bit Server VM 25.51-b03 Runtime: Java(TM) SE Runtime Environment 1.8.0_51-b16 System: Windows 7 version 6.1 running on amd64; Cp1252; en_US (nb)
Thank you, it is duplicat for Bug #245626. I made bug report in Bug #253857. After it is fixed we can fix this issue. *** This bug has been marked as a duplicate of bug 245626 ***