Hello All, Thanks for all the great OpenSCAD work! I've been using older release versions since 2016, but now am using 2020.12-RC3 in Win7 Pro SVC Pk 1, DotNet V4.7.3062.0 Here's the problem. I instantiate OpenSCAD ver 2020.12-RC3, I do some work. I Click the 'x' gadget in the upper right corner of the program Title-Bar to Exit the program. I Exit the program, then later restart the program, do some more work, exit, and then re-instantiate, exit, etc. Shortly, after a few of these start/exit cycles, windows begins to become very sluggish, responsiveness becomes 'jumpy', mouse carrot doesn't keep up with movement, etc. In looking at the Windows Task Manager, I see that the OpenSCAD program is not depicted in the "Applications" dialog as I did Exit the program, yet there is an OpenSCAD.exe running for each instance where I started the program, which are still running in 'background'. At times I may load and exit the program four or five times durring a design, slice, print session. Each instance leaves some part of the program running, eating up system resources. To be thorough, to Exit program I also tried, Click File Click Close - which apparently closes the program, while leaving something running in background as indicated in the Processes dialog of the Windows Task Manager. And also Clicking File > Quit and-or depressing ^Q, also exhibits the same problem, eg., not killing the background OpenSCAD.exe process, And then also, intermittently, the program not only does not Exit, but also, reports "Program not responding" error message, and screen becomes low-lighted, eg, 'loses focus' and the only strategy to close it is to kill the process via the Task Manager. Another issue that I've seen, concerns the IDE's editor "Find" function, which intermittently can't find or misfinds text. One example I was searching for the color "orange", the IDE stopped on Mot"or". Here are a few images for y'all to gander at: Task Manager Depicting OpenSCAD.exe Application not running... <http://forum.openscad.org/file/t1262/Applications_Running.jpg> Task Manager depicting OpenSCAD.exe running in background when OpenSCAD "Application" isn't running: <http://forum.openscad.org/file/t1262/Running_Processes.jpg> Hope this helps... Thanks, Drafter -- Sent from: http://forum.openscad.org/