Front Row on Leopard no longer uses iTunes for music playback. It 
plays back your music directly. Thus, if you make changes to your 
iTunes library while having Front Row in the front, these will not be 
reflected.

Another side effect of this is that on Leopard, if you quit Front Row, 
your music will also stop abruptly. Same if you had music playing in 
iTunes and enter Front Row.

This, however, is not an issue with or of Remote Buddy.

I don't have access to the final build just yet (still downloading), 
but if you feel Remote Buddy becomes unresponsive, please fire up 
"Activity Monitor.app", select "Remote Buddy" and choose "Analyze" 
from the menu, then send me the output to info@iospirit.com or via the 
contact form. I can then see what keeps it busy.

I myself have not experienced a single issue with 1.7.4 on Leopard 
thus far.

Best regards, 
Felix