How are you trying to enter notes into the prv?
 
A simple click with the mouse doesn't do it - there are 3 different ways to achieve this:

1. Use alt + enter
2. Double Click
3. Click & Drag

this could be a case of just not being furmiliar with the right tools for the job.
the browser thing doesn't sound normal, try another mouse.
yes, plug in another mouse and see what you get.
 
but for the prv, it could be a case of you might not understand how the tools work yet, I mean this as no disrespect ;-)
 
best of luck on this

i can confirm this issue, but my config is slightly different I am sure.
 
First, my X3 install on my studio PC is rock solid, no issues at all.
 
However, I just got done installing Sonar on a new MacBook Pro retina.  I used Boot Camp and installed Windows 7 Home Premium, the same thing as I run on my studio PC.
 
I am seeing the same behavior.  I can show and hide the browser using B but the mouse does nothing.  Curiously, the mouse work on everything else without a hitch, including Pro Channel.  To me, this rules out a mouse driver issue.
 
in addition, I cannot get the PRV to show no matter what I do.  Hot key doesn't work and neither does selecting it from the menu.  This is a fresh install and I have applied X3d.
UPDATE: The PRV does show now.  That was pilot error.  It shows in the multidock but is minimized by default.  The only issue I am now having is the browser.  I simply can't figure out how to get it to function.  Clicking with the mouse just simply isn't working.I have tried a USB mouse along with the trackpad of the MBP.  Same results...nothing,
 
I am using a Saffire 2i2 interface and a Axiom Pro 49 keyboard.  I have 8 GB of RAM and a 256 GB SSD (standard for the rMBP) along with an attached G Drive via USB. I have not installed any other VSTs at this point.
 
Very strange behavior indeed.  I will monitor the thread and also let you know if I fid a solution.
 
UPDATE: This issue only seems to happen to me if I am starting with a blank project.  If I start with a template, the browser is available and works as expected.  Not sure why the blank project is an issue and it certainly doesn't occur on my studio workstation, but I can easily work around it.  Hopefully this will help the OP.