stefanob

@Rick Brewster BINGO!!!! I have removed the Cascadia font and the problem is solved! I don't remember when I installed that font, but not recently, so I don't understand why the problem has appeared just now. Thank you very much Rick for your support!! Best regards!

@AndrewDavid the app is Windows Mobile Device Center, I use it to connect MS Visual Studio 2008 (another dinosaur...) to an HMI running Windows Embedded Compact 7 to debug in real time CE applications. We are abandoning Windows CE but sometimes I still need to work on those software.

Hi Andrew, yes, I have turned off Windows Update and my operating system is stuck to version 1607 so I have missed a lot. Im not happy about this but I need an old MICROSOFT application that I was not able to run in newer OS versions.

Hello Rick, I have done what you asked and I have sent you a performance trace, I hope this can help.

I have installed .NET 6.0 but it did not solved the problem. Now I have installed Paint.NET 4.0.20 and things are better even if in reality the problem persists. Now I can change font and go on working but the CPU usage goes to 25-30%; since I have a 4 cores CPU, I suspect that Paint 4.0 is not a multi-core application while 4.3 is.

Hello AndrewDavid, thanks for your suggestions. My fonts are installed in C:\WINDOWS\Fonts and in the Settings I have not found a Font menu but in the Tools menu, in the Text section (see image) there is a font combobox that behave in the same manner as the one in the main Paint.NET interface: if I open it, Paint takes 100% CPU. In other application (Word) I can use fonts without problems. I have downloaded and installed a font and I can see it both in Paint than in Word (but Paint takes 100% CPU...) I hope that the problem is not not updating Windows. I have this problem only witn this last version of Paint, now I look for the previous one.

Hello Red ochre and thanks for your reply. I had a plugin, ReplaceColors; I removed it but nothing change

Hello Pixey and thanks for your reply. I attach a (low quality) video to show what is happening. When Paint.NET is at 100% CPU all I can do is to kill it in task manager because it is not responsive, I mean it does not hang but it is unusable. paint.zip

I have just updated to version 4.3.4 and when I use the Text tool, if I don't change the default font (Calibri) everything works but if I try to change the font, Paint.NET takes 100% CPU (multi core CPU!!!) and I have to kill it. It is enough to open the font combobox to have this effect. I have uninstalled Paint and reinstalled it but nothing changes, I can't change font. My OS is Windows 10 pro 64bit v1607 (I can't update for compatibility issues). Any suggestion to solve this problem? Thanks