I find the scrub function handy in the PRV in X2a.
 
When I scrub across midi notes the now time cursor/line smears all over the display (so I end up with hundreds of now time cursors).  They disappear the minute I let go of the mouse button, but the effect is pretty messy.
 
Does this happen to everybody ?  Or perhaps I should ask, is this the way it's always been ?
 

Sounds like a graphic card issue. Don't think it's Sonar since a lot of weird things like this happen to me off and on. Though I've never seen this one.
 
Steve

Right, it does what it is supposed to do here without screwing up the screen. 

Paul - I have the same issue with X2A. Scrubbing in the PRV gives graphical anomalies all over the screen, a lot of vertical lines that disappear when you let go of the mouse button.

Should be reported as a bug even if it doesn't affect everyone!

Lets see if there is a common reason for this. Can you and the OP list your graphics system your OS and what sort of system you are running X2 on?

How have you set up your display? 

I just tried it again to get a better picture of what's happening.
 
This problem occurs all the time, full screen, windowed, docked, undocked.
 
If I scrub back and forth a bit, thereby filling up the view with tightly packed vertical lines then, without moving horizontally if I move vertically (still keeping the mouse button pressed) the horizonal 'beam' that follows the cursor to tell you what note your on will erase the part of the vertical lines that it crosses.  The parts of the vertical lines that haven't been 'scrubbed' by this horizontal beam remain on the screen.  When I let go of the mouse button, the mess goes away.
My system :
 
Intel XEON E5-1620 CPU (quad core) - no onboard intel graphics
ASUS P9X79WS motherboard
16GB ECC memory
MSI Radeon HD7950 Twin Frozr III graphics card
Dell U3011 monitor  2560x1600
Windows 7 Ultimate SP1
OS, apps and Sonar on an SSD, the rest on HDDs.
 
I've mentioned this in a few messages : SONAR X2 and X2a sometimes screws up my wireless USB mouse.  No other program has ever done this.

 
This is what this looks like :
 

 
It would also be nice if J toggled scrub on and off.
 

Herby?? No wait, that was the Love Bug. Sorry.

Seriously I think you have a graphic card not getting along with Sonar.
Try running in Classic mode.

.

I'm seeing this bug as well (I'm using Sonar X2).  It is very distracting, almost to the point that I avoid using the scrub tool...
 
I investigated the possibility that it was a video card issue, as suggested above.  Even after completely removing all traces of my video driver, and using Microsoft's generic VGA driver (with crappy resolution and all), I still see this bug.
 
Furthermore, I went back to Sonar 8 to see if it happens there, and verified that this bug does not occur in Sonar 8.
 
So whatever is causing the issue, it is a problem with Sonar X2, not Sonar 8, and happens with my manufacturer supplied graphics driver as well as with Microsoft's generic video driver.
 
Here's my system info:
Windows 8.0 64 bit
ASUS EAH5450 graphics card
Intel i7-3770K 3.5 GHz (no overclocking)
Intel DZ77BH-55K motherboard
Samsung monitor, 1440x900
 
Ideas?
 
 
 
 

There could be a bug in the coding, though, it is possible for it to still be a hardware/driver type issue because there can be a difference in the way Sonar 8 and the X series behave with them.