I just purchased Scaler this week and have tried it on both my laptop and my Studio machine and in Sonar the GUI comes up and is missing a section of it on the right hand side. (it is the latest version 1.6)  I tried it in cantabile to compare and it worked fine and you are able to resize it as well, any suggestions?

F.Y.I.W.
Check to make sure it's not in "demo" mode.
I think there is an activation process.
 
Also check to see if you can have it running on more than one computer?
I'm getting ready to buy it as well.
 

Crowned One
in Sonar the GUI comes up and is missing a section of it on the right hand side.

Haven't tried it with Sonar but was seeing the same thing with the VST3 version in Mixcraft.  Switched to VST2 and the GUI was fine.

Are you sure you have it sized out as far as it will go on the right side?  If it's not opened out far enough you will see scroll bars and the far part of the right side isn't visible. I checked mine and I can recreate what you described by running the cursor over the far edge of the GUI until I see the double arrow, then dragging it to the left.  If I pull this out to the right it open up further.
 
JB

Thanks Guys for the reponses, I really appreciate it!!
I had managed to register it on both machines but I was unable to find the far edge where you can resize it, this was strange beacuse it worked in cantabile. 
Anyway I have tried the VST2 option and that worked perfectly so seems to be something with the VST3 version.
Most important thing is it now works and I can resize as needed.

I have mine on VST2 and it works OK.  Anyway, glad you have it worked out.  Scaler is a great program.  I can't say enough good things about it.  Did you know there's a fine tech support for it: https://forum.scalerplugin.com/c/general
Most of the time they respond in a timely manner.
I not sure, but I think the guy who responds most (a guy named Ed) is the owner/creator.  Have fun!
 
JB
 
 

I saw Scaler in the December 2018 issue of SOS Magazine.  I checked it out on the Plugin Boutique Shop and I fell in love with it.  I got it for $36.00 on Sale.
 
 

I did hear back from their support and they are aware of the issue and said it should be fixed in an upcoming update.