No problem, if there is a bug, I would definitely like to fix it. Please take a look in this XviD post on how to report a potential bug:
XviD: What You Must Do When Posting Bugs/Problems! Not all applies to RealVideo bugs, but much of the same information is useful for us.
Other useful tools to be aware of are the visualization support in the RealVideo 10 'Elysian' decoder DLLs. With strength set to 1 and visualizations to 2, you get a useful display when playing back the video of which quants were used for each frame. If they appear too high, compared to the fixed quality you were using, there is for instance a problem. And of course, the rv9log.txt file from the encoder, since it contains both quants and PSNR for every frame.
Thanks!