The ' tuxpaint -verbose-version' may also be useful. You can also run ' tuxpaint -version' from a command-line terminal, check your Tux Paint installation's documentation pages, or tell from the name of the installation file you downloaded (e.g., ' tuxpaint-X.Y.Z-windows-x86_64.zip'). Tux Paint displays its version number at the bottom left corner of its splash screen. Apple provides instructions here for installing and launching apps from 'unidentified developers.' macOS / Mac OS X 'Unidentified developer' error Recent versions of macOS have default security settings that prevent programs which were downloaded outside of Apple's 'App Store' from being launched.Then, click 'New' and input ' SDL_RENDER_SCALE_QUALITY' as the variable name and ' linear' as the variable value. Click 'Environment Variables.' on the 'Advanced' tab. Input 'SystemPropertiesAdvanced' to the text box and click 'OK'. On Windows, press ' + ' key to open 'Run.' dialogue. For example, on Linux, you can run Tux Paint from a command-line as ' SDL_RENDER_SCALE_QUALITY=linear tuxpaint'. Alternatively, you can set the ' SDL_RENDER_SCALE_QUALITY' environment variable to ' linear'. Adjust Tux Paint's settings to either use the 'Native' option, or select a window size that more closely matches your monitor's native resolution. e.g., if your monitor is 1920x1080, it will scale Tux Paint 135%, to 1440x1080 (with 240 pixels of black border on either side). Tux Paint appears jagged/pixelated in fullscreen Tux Paint built using SDL2.0 will attempt to scale the Tux Paint window from the chosen size (which defaults to 800圆00) to the monitor's native resolution. While the font cache is generated behind the scenes, Tux Paint should remain interactive (showing an animated 'please wait' animation) while this process runs.

Subsequent launches of Tux Paint should be fast. The font system used by Tux Paint (Pango) is creating a 'cache' of information about the fonts on your system. Tux Paint loads very slowly The first time Tux Paint is launched (for a particular user), it may take a minute or more to respond.

If you are still using Tux Paint 0.9.27, please see that version's 'Known Issues' list.

Tux on the run