If category / folder selection applet fails to start, as shown on the image below, most commonly this error is caused by disabled Java applets. How to enable Java applets- In Lotus Notes, select "File" -> "Preferences".
- In "Preferences" window, select "Basic Notes Client Configuration" section.
- In "Basic Notes Client Configuration" -> "Additional options", put a check-mark on "Enable Java applets".
- Press "OK".
- Restart Lotus Notes.
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