Hello, I just started testing. I'm in the first week of trial period. I ran into a bug and thought I should report it.
Here's my info:
Directory Opus Pro 11.4 Build 5229 x64
OS 6.1 (B:7601 P:2 T:1) SP 1.0 "Service Pack 1"
Running on Windows 7 Pro.
I have dopus set up with tree on left, 1 lister in middle, preview on right. I right-click on lister tab and select Duplicate Tab On Right. Then right-click on the new tab and select Split to New Lister. That's when I get the error. I reproduced this four times.
Attached is a screen shot of the error.