I ended up finding a solution so I apologise for the distraction. 

Nevertheless, someone else may encounter the same problem, so here's my work-around.

I added code to to the 'scrollhorizontal' event of the subject datatwindow (say, dw_1) to change focus to another object, ie 'dw_2.SetFocus()'. 

This worked ok - just like a bought one.

Sorry Govinda, I omitted to add that it is 32 bit and it is not a rich text edit, simply a type string in a single-row grid dw object, length 3000.

Thanks for your interest.

The client is using a version compiled in Appeon 2017 on a Windows 7 OS.

I'm developing now in R2 on Windows 8.

The problem occurs both in R2 development and 2017 executable modes.

The underlying problem I presume is with the width of the dw object but the slide seems to work if I move it and then change focus by clicking outside the dw. 

So today I'll experiment with code on the lbuttonup event to switch focus. 

Hi William,

Can you help us with more info on your case:

• What Version/build of PowerBuilder are you using?
• Is this happening during runtime?
• Are you using the RichTextEdit Control?
• Is your application 32 or 64 bits?

Regards,

And you are using Powerbuilder 2017 / 2017R2 or an older version?

Andreas.