Tux Paint 0.9.29
(April 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.

• Windows
  No known issues
• 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