I was just reading the POV-Ray help file in the RC3 Windows version about the
radiosity save_file / load_file deprecation and see this:

Radiosity_File_Name="" or +RF"" to set the cache file name;
Radiosity_From_File= or +RF   to enable reading the radiosity file at startup
Radiosity_To_File= or +RFO  to enable writing new samples to the radiosity file
....
If both +RFI and +RFO are specified, new samples gathered are appended;
otherwise, +RFO causes the file to be overwritten if it exists.

Maybe you've caught & fixed this already, but the command line param for
Radiosity_From_File should be +RFI instead of +RF.

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