I have been using Pixinsight (including CloneStamp) successfully for several months.
Yesterday, CloneStamp (after having worked well for a while) started generating a Windows error message right after I do Ctrl-Click to select a point. The error message is attached.
Incidentally this error message recurs several times before it will clear for a few seconds and allow me to close the Clone Stamp module.
NOTE: This bug survived uninstall and reinstall of Pixinsight, so I'm at a loss as to what's going on.
It is NOT image specific, but it appears to happen when I'm using CloneStamp at 1:1 magnification and larger, and does not happen when I'm zoomed out more. (However CloneStamp *was* working before this issue started using 1:1 and even more zoomed-in views).
My system has more than 200GB of available disk space on the SSD, and is an i7 system with 32GB RAM, so it should not be a resources issue. Windows 10 with all the updates.