@joe depok said: hellooo .... after such uninstall & install .. finally I can use the round corner success .... I again follow the instruction include the "permission" for the plugin folder. thank you thank youuuu ... but ....it seems that after I update mysketchup program I found that my cursor is not pointed on the right place... for example I want to point the angle . normally I just point my cursor on it and it will snap on the angle.. but now i have to put my cursor somewhere around it to get the snap .. oh my god.... hi joe, it seems you may have a corrupt .plist file.. it's possible that all of the uninstall/reinstalls may be the culprit (the sketchup plist files will not remove themselves upon a typical unistall..) you have to trash them manually. try this: --close sketchup --click on finder in the dock --click the 'go' menu at the top of the screen --hold down the option key --a new menu item named 'library' will appear under the go menu (this is the user library-- click on it) --open the folder named 'preferences' --find the file 'com.google.sketchuppro8' (or whatever version you're using) -- trash the file then launch sketchup edit- please note** trashing the .plist file then restarting sketchup will create a new .plist... however, all settings will be at default so it will appear as if you've launched sketchup for the first time (welcome screen, standard template, etc)