Tux Paint 0.9.28
(June 2022)

• All Versions (global issues)
  

  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. The font system used by Tux Paint (Pango) is creating a 'cache' of information about the fonts on your system. Subsequent launches of Tux Paint should be fast.
  
  While the font cache is generated behind the scenes, Tux Paint should remain interactive (showing an animated 'please wait' animation) while this process runs.

  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 800x600) to the 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). 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.
  
  Alternatively, you can set the "SDL_RENDER_SCALE_QUALITY" environment variable to "linear". For example, on Linux, you can run Tux Paint from a command-line as "SDL_RENDER_SCALE_QUALITY=linear tuxpaint".
  On Windows, press the "[WINDOWS] + [R]" key combination to open "Run..." dialogue. Input "SystemPropertiesAdvanced" to the text box and click "OK". Click "Environment Variables..." on the "Advanced" tab. Then, click "New" and input "SDL_RENDER_SCALE_QUALITY" as the variable name and "linear" as the variable value.

  Tux Paint crashes using Fill tool Brush or Radial modes

  This bug was fixed in Tux Paint 0.9.28-3, currently available for Windows, RedHat Enterprice Linux (RHEL) 7, 8, 9, and Android. Please upgrade. (See Bug #269.)

• Windows

  Some letters do not appear when typed in the Text or Label tools

  This appeared to affect Windows 11 with 22H2 Update applied, on 64-bit systems. A new build of Tux Paint 0.9.28, labeled '0.9.28-2', was released in late November 2022 which appears to address the issue. Download it from the Tux Paint Windows download page. (See Bug #264.)

• 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.
  
  Apple provides instructions here for installing and launching apps from "unidentified developers."

• Linux
  No known issues