"blank page" problem after upgrade 1.3.4->1.4.10

[graemerae]

I've looked through the docs and searched the forums, but can't find anything that seems to match this.

Everytime (I think) I try to 'submit' something using a form button I get a blank page returned.  putting debug mode on doesnt help, as nothing is shown...

I can upload using the single file approach as specified in the FAQ, but if I use multiple upload slots even with a tiny file, when I  assign an album and submit, the page returns blank.   

http://photos.surfline.com/upload.php

I am also getting this blank result page in a couple of other places too. 

If I login :
http://photos.surfline.com/login.php?referer=index.php
This returns a blank page.  Reloading the original page shows that I am now logged in though.


If I change a config setting:
http://photos.surfline.com/admin.php
(the setting changes, but the page after 'submit' is empty


Any ideas?  this is very wierd. 

I think I've got all my language files installed.    Heres the list of files in /

404.html
addfav.php
addpic.php
admin.php
adtest.html
albmgr.php
albums
anycontent.php
banning.php
bridge
bridgemgr.php
calendar.php
catmgr.php
CHANGELOG
charsetmgr.php
config.php
COPYING
day.php
daythumb.php
db_ecard.php
db_input.php
delete.php
displayecard.php
displayimage.php
displayimage.txt
displayreport.php
docs
ecard.php
editOnePic.php
editpics.php
exifmgr.php
faq.php
footer.html
forgot_passwd.php
getlang.php
groupmgr.php
hacks.tar
image_processor.php
images
import_gallery.php
include
index.php
installer.css
install.php
keyword_create_dict.php
keywordmgr.php
keyword_select.php
lang
login.php
logout.php
minibrowser.php
missing.txt
model.html
mode.php
modifyalb.php
net2ftp
phpinfo.php
phpmy
picEditor.php
picmgr.php
pluginmgr.php
plugins
potd.php
potw.php
profile.php
ptd.zip
ratepic.php
readme
register.php
relocate_server.php
report_file.php
reviewcom.php
scoopnose.jpg
scripts.js
searchnew.php
search.php
showdaypic.php
showthumb.php
showweekpic.php
sql
stat_details.php
themes
themes.tar
thumbnails.php
update.php
upgrade-1.0-to-1.2.php
upload.php
usage.html
usermgr.php
util.php
versioncheck.php
viewlog.php
week.php
weekthumbdeploy2.php
weekthumbdeploy.php
weekthumb.php
xp_publish.php
zipdownload.php

[graemerae]

Additional info...

I think it's related to the potd plugin.  This is in my error log:

[client ##.##.##.##] PHP Fatal error:  potd_filter_page(): Failed opening required 'plugins/potd/include/init.inc.php' (include_path='.:/usr/share/pear') in /var/www/html/cpg134/plugins/potd/codebase.php on line 164, referer: http://photos.surfline.com/upload.php

If i disable the potd plugin everything works fine.