Nope, as the only differene between the 2.1 and the 2.2 versions is that for 2.2 there is a GUI installer on Mac OS X and the .exe extensions are removed for executable files on Linux and Mac OS X. If you are on Windows, they are practically the same.
i recently got this error on a job. warning No bitmap buffer specified. then the render completes without rendering the frame. is this part of the same bug?
No. The bug described above was specific to V-Ray RT only and happened because the render server attempted to render the scene before all the scene change commands were received.
Your bug is most probably related to the V-Ray for Maya translator, although I don’t know right away what is wrong with it. If you have a scene that you can send to vlado@chaosgroup.com it will be helpful.