Here is the system stuff as per support guidelines plus a bit more, just in case.
I couldn't find any reference in (I could have missed it):
http://sabnzbd.wikidot.com/faq
http://sabnzbd.wikidot.com/user-manual
SABnzbd Frequently Asked Questions
SABnzbd User Manual
program/system stuff
SABnzbd Version: 0.7.14 | smpl ski
XP SP3
Windows Installer, Windows zip
Smpl
windows firewall plus avast
no_ipv6 ( off ) check box empty in settings
Is the issue reproducible? (yes) This does not happen all the time but it does happen.
Post processing
Ignore Samples Filter out sample files (e.g. video samples).
Enable Quick Check Skip par2 checking when files are 100% valid.
Enable Unrar Enable built-in unrar functionality.
Enable Unzip Enable built-in unzip functionality.
Enable Filejoin Join files ending in .001, .002 etc. into one file.
Enable TS Joining Join files ending in .001.ts, .002.ts etc. into one file.
Enable Par Cleanup Cleanup par files (if verifiying/repairing succeded).
Fail on yEnc CRC Errors When article has a CRC error, try to get it from another server.
Post-Process Only Verified Jobs Only perform post-processing on jobs that passed all PAR2 checks.
Enable SFV-based checks Do an extra verification based on SFV files.
Check result of unpacking Check result of unpacking (needs to be off for some file systems).
Enable MultiCore Par2 Read the Wiki Help on this!
Extra PAR2 Parameters Read the Wiki Help on this!
Nice Parameters Read the Wiki Help on this!
IONice Parameters Read the Wiki Help on this!
Special Switches (in case I have screwed stuff up)
start_paused ( off )
no_penalties ( off )
ignore_wrong_unrar ( off )
create_group_folders ( off )
queue_complete_pers ( off )
api_warnings ( on )
allow_64bit_tools ( on )
par2_multicore ( on )
never_repair ( off )
allow_streaming ( off )
ignore_unrar_dates ( off )
rss_filenames ( off )
news_items ( on )
osx_menu ( on )
osx_speed ( on )
win_menu ( on )
uniconfig ( on )
use_pickle ( off )
allow_incomplete_nzb ( off )
randomize_server_ip ( off )
no_ipv6 ( off )
keep_awake ( on )
overwrite_files ( off )
empty_postproc ( off )
web_watchdog ( off )
wait_for_dfolder ( off )
warn_empty_nzb ( on )
enable_recursive ( on )
Values
size_limit ( 0 )
folder_max_length ( 128 )
fsys_type ( 0 )
movie_rename_limit ( 100M )
nomedia_marker ( )
req_completion_rate ( 100.2 )
wait_ext_drive ( 5 )
history_limit ( 50 )
show_sysload ( 2 )
ipv6_servers ( 1 )
rss_odd_titles ( )
prio_sort_list ( )
Thank you.........