


TeamViewer should come back up just fine, but I'd still recommend doing this with physical access to the machine, just to be 100% safe. Install it (no need to uninstall before).Download the most recent version of TeamViewer from the official download page (if you are using TeamViewer Host, download that).It can also happen if the TeamViewer app you have installed has been damaged. This can happen if you have multiple different versions of TeamViewer on your Mac, or if you moved TeamViewer outside of its standard location in Applications.

From another computer with teamviewer signed in, you should now be able to click on the computer you want to connect to.and teamviewer will prompt you for the password because it is no longer saved.This message can occur if the version of the helper tool that is installed does not match the version and/or product of TeamViewer that is attempting to talk to it.Wait a few seconds for the settings to sync up across all your teamviewer computers. Delete the saved password in the top right input box (you should just see bullet points if there is a password saved, and nothing if there is no password saved).In the top right of that window, select the little gear icon, and choose "properties". Click the little down arrow to the right of the computer's name, and a window will drop down.It should say "(this computer)" next to your computer's name. Inside EACH computer's teamviewer Computer's & Contacts window, you must find your currently signed in computer.Sign in on EACH computer using your Teamviewer account username & password.You must do the following From EACH computer you wish to require a password prompt for, because it won't allow you to change these settings except through the local computer's teamviewer application (though you can connect to the remote computers via teamviewer and change them individually through the remote connection). I wanted the same thing.because leaving all your computers accessible without a password prompt to anyone that has access to any of your other computers is very insecure. As I understand it, basically, you want to keep your teamviewer computers signed in.but when you connect to another computer that you own (that's in your computers & contacts list), you want teamviewer to prompt you for that computer's teamviewer password. Most of the other answers aren't really answering your question.
