Overviewer sticking. Possible PIO issue?

Overviewer stuck 1

C:\Overviewer_beta>overviewer.exe --web-assets-path=web_assets_NewWorld --settings=settings_NewWorld.py "worlds\NewWorld" "maps\NewWorld"
2011-12-13 09:49:52  Welcome to Minecraft Overviewer!
2011-12-13 09:49:55  Scanning regions
2011-12-13 09:49:57  Scanning chunks
2011-12-13 09:49:57  Rendering the following tilesets: normal
2011-12-13 09:49:57  Scanning chunks and determining tiles to update for each rendermode requested.
2011-12-13 09:49:57  Doing 1 scan in 1 worker process
2011-12-13 09:50:11  Scan finished. 26092 total tiles need to be rendered at the highest level
2011-12-13 09:50:14
2011-12-13 09:50:14  Rendering highest zoom level of tiles now.
2011-12-13 09:50:14  Rendering 1 rendermode
2011-12-13 09:50:14  Started 1 worker process
2011-12-13 09:50:14  There are 26092 tiles to render at this level
2011-12-13 09:50:14  There are 9 total levels
2011-12-13 09:50:14  0/26092 (0.0%) tiles complete on level 1/9
2011-12-13 09:54:27  400/26092 (1.5%) tiles complete on level 1/9
2011-12-13 09:54:28  800/26092 (3.1%) tiles complete on level 1/9
2011-12-13 10:19:10  2000/26092 (7.7%) tiles complete on level 1/9
Cancelled @ 10:38 am.