Possible errors are:
SFR database corruption is detected and SFRs are recreated automatically.
When the SFR database is recreated, custom SFRs are deleted.
First, check if the folder for the SFR database location exists on your PC:
1. Open Tools | Options | SFRs.
2. If the SFR database does exist (indicated in the Default field), then press Recreate database.
Create a new workspace and open the SFR Window via View | Special Function Registers. You should see the SFRs of your configured device.
It is recommended to prepare a PC working environment.
Click Debug | Debug Options | SFRs | Recreate database.
Manually recreate the database:
1. Click Debug | Debug Options | SFRs | Open. This will open the folder which contains the SFR database.2. Close winIDEA.
3. In the opened folder, go up one level and delete the SFR folder.
4. Open winIDEA. The SFR database will be recreated. Depending on your PC it might take a couple of minutes.