It took me a while to find the culprit of an annoying focus-stealing hiccup in OSX.

At first it was harmless, just annoying. When working with my new 24 Artist Pro Tablet from XP-Pen I experienced a sudden misalignment of the cursor, nearly 15 minutes after every calibration.

I even catch the driver by being disconnected for a second and wrote to the XP-Pen service about this issue as I assumed it to be a driver issue and it appeared just with the new UI-driver from XP-Pen, the official driver did not show this at all.

I looked for an app that would help me find the "focus-stealing-app" and found this tool in the EventViewer from Karabiner-Elements which I can recommend as it is easy to use.

The glitch happened also in Photoshop when painting and it would take a few seconds to register keys or strokes again when painting. With the EventViewer I found that CUH.app was responsible for these timed hiccups:

Bundle Identifier:  com.corel.CUH
File Path:          /Library/Preferences/com.corel.CUH/CUH.app/Contents/MacOS/CUH

It also does not help to watch out for it on the activity monitor because like a real potentially unwanted program it pops-up every 15 minutes and then close after a few seconds.

This is a very bad behavior from Corel and it made clear to me that this company does not deserve my money in the future.

Other artists and users came up with a solution - namely uninstalling the software as a whole. But since I paid money for this, that solution was unacceptable, so I found a way to make it work without the annoying adware from Corel!

I can only speak for Mac, but I assume there is a similar app out there for Windows.

First I used the path from the EventViewer above and deleted that particular folder, however that did not help as the PUP did re-instal itself and haunted me again as a Potentially-Unwanted-Zombie-App! Oh noes!!

Now I went on trying to deactivate messages from within the app which can be done in the Corel ... Menu like here:

Now I went on and installed Knock-Knock from Objective-See:

https://objective-see.com/products/knockknock.html

It is an investigative tool to find potentially unwanted programs on your Mac and it goes into the deeper libraries to see if there is something that does not belong there - it also looks up files on VirusTotal for malware rating. 

I'm sure there is an equivalent for Windows out there. You could also do a deep search on the filename from explorer. Since I got the info from the EventViewer that CUH.app is responsible, I looked that up in Knock-Knock and found 2 listings. 

If you find only one entry it might work but I'm rather sure there are 2 different apps in preferences and application support that have to be found - and whatever the equivalent is on Windows.

I then opened the paths and instead of deleting them, I added .bak at the end of the filename but I'm sure if you add .f**koffCorel at the end it will work well too ;)

Since then there is silence and the program still works!

I kept the EventViewer open for around 3 days just to see if there is another resurrection of the zombie-app but so far it is clean.