OpenBSDとlibpngのKeePassのバグ

OpenBSDでKeePassを実行しようとしています。パッケージからMonoをインストールし、KeePass-2.30-portableをダウンロードしました。残念ながら、次のエラーが原因でKeePassを起動できませんでした。

SendMessage (27263013, 0x112c, 0x4, 0x4)
libpng error: invalid after png_start_read_image or png_read_update_info
libpng error: invalid after png_start_read_image or png_read_update_info
libpng error: invalid after png_start_read_image or png_read_update_info
libpng error: invalid after png_start_read_image or png_read_update_info
SendMessage (27263007, 0x101f, 0x0, 0x0)
SendMessage (0, 0x1203, 0x0, 0x7f7ffffd1650)
SendMessage (0, 0x1204, 0x0, 0x7f7ffffd1650)
SendMessage (0, 0x1203, 0x1, 0x7f7ffffd1650)
SendMessage (0, 0x1204, 0x1, 0x7f7ffffd1650)
SendMessage (0, 0x1203, 0x2, 0x7f7ffffd1650)
SendMessage (0, 0x1204, 0x2, 0x7f7ffffd1650)
SendMessage (0, 0x1203, 0x3, 0x7f7ffffd1650)
SendMessage (0, 0x1204, 0x3, 0x7f7ffffd1650)
SendMessage (0, 0x1203, 0x4, 0x7f7ffffd1650)
SendMessage (0, 0x1204, 0x4, 0x7f7ffffd1650)
* Assertion at strenc.c:183, condition `utf8!=NULL' not met

Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) KeePass.Native.NativeMethods.GetFileAttributes (string) <0xffffffff>
  at KeePass.Native.NativeMethods.FileExists (string) <0x0002d>
  at KeePass.Util.WinUtil.RemoveZoneIdentifier (string) <0x0006e>
  at KeePass.Forms.MainForm.OnFormLoadParallelAsync (object) <0x00090>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

Abort trap (core dumped) 

助けてくれてありがとう。