Middle button click freeze after installing the Windows 10 Creators Update

[Seelge]

It seems TrackballScroll has a problem with the Windows 10 Creators Update (April 2017). Middle button clicks seem to freeze mouse input by several seconds.

Any ideas what could cause this? A similar bug did exist in earlier, pure C++ versions, of this program, but it did only appear when metro style apps were running.

[ArmanHayots]

Look's like the only way to beat all sorts of troubles is writing a custom driver.
It's too bad that my skills are not enough for this.

[Seelge]

Some test results:

• sendinput is used to send mouse events, which works fine.
• The sentinput line which sends the middle button click causes the freeze/delay. Without it, everything works... without actually doing anything.
• Using TestApi to send the middle button mouse click causes the same issue.
• Using TestApi to send a mouse move causes the same issue.
• The delay/freeze time varies and by clicking wildly it is possible to create a zombie process which cannot be killed without restarting.

[Seelge]

Fixed by @johnwoolee

Thanks for the PR!