When doing a rendering make sure that the file type saved to is a BMP. (Edited As I understand the Render options, there are 3. The "Live Interactive Option' that allows lights to be 'ON' while moving about in 3D space, the Basic option which is Raytrace and the Advanced Option which is Radiosity and Raytrace. I understand you CAN use a jpg with Basic but not with Radiosity. For this reason I just use a bmp all the time).
To check your settings start with the Options box at the bottom of the Real View page and follow the attached number sequence. Hit OK or Apply retain BMP setting from the drop down.
If you use the jpg option (edited With Radiosity) it will be WHITE / and O KB (Also make sure you have 'Render to File' checked).
Z