At some point I'd like to see a hot key/content menu item to suspend cf from operation - not grabbing from the system clipboard. If implemented, changing the color of the system tray icon or adding an overlay to the icon would indicate whether CF is active again.

I use another macro program and some of the routines copy multiple instances of text during a single session. There is no need for cf to become involved and grab any clipboard text during this time.

The Pause/Resume hotkey feature is working perfectly. Great addition to CF.

The only problem I have with Beta 4 is sometimes the tray icon disappears indicating to me it's not loaded. However, upon going to the Start menu, I get a message it's already running. The "cure" is to use Windows Task Manager to kill the process and then reload. Not a big problem, just somewhat annoying.

I've seen this on both Windows 7 Professional and Windows 10 Professional. I also have running in the system tray:
Quick Macros
Roboform
PNotes.NET
WordWeb
Listary

One or more of the above may be associated with this error as I have the same things running on both computers. It's the only commonality I can find.

As this is a sporadic problem and only annoying, I wouldn't put this anywhere near the top of your list.