ok, well I figured out where the problem lay and "fixed" it - kind of.

the problem is with ob_get_clean here:
libraries/joomla/environment/response.php ~line 198

if I comment that out it works fine. something to do with output buffer size. I know that this is more a core joomla thing but it is only happening with the SEF list.

I wish I could fix it without removing that so if anyone has any ideas I'd appreciate the help.

I turned on joomla system debug and tried to change the "all sefs" to show "all" and completely blank screen. source shows nothing, no header, body, nothing.
=(

no, the screen instantly goes blank. also, as I said it ONLY happenes in viewmode=3 "listall", if I leave it at 50 it works, if I filter to custom or sef it will "list all" which is about 800+ for each of those. but it is the full list all that it breaks and as I said the records were sitting at 4099 when it happened which makes me suspicious there is a hard/coded limit somewhere. I have checked my server error logs and have not seen anything but I will enable debug, though I'm not convinced that will show anything either.

Hi,

I have been zipping along adding our SEFs (thousands of them) when suddenly the admin page for administrator/index.php?option=com_sef&controller=sefurls&viewmode=3 went blank.

I checked the database and saw this happened when I tried to add link number 4100 (4099 were listed).

We have used JoomSEF before with our old 1.5 installation and never had this issue. Is there some sort of limit on the list length now?

If I sort it by "custom" or "sef" I can show all still, but if I try to list all while showing all redirects the page goes blank. also, if I make the list length 50 or 100 the "Show All Redirects" link works but when I try to click next or another page number it goes blank again.

We are using Joomla 1.7.2 with newest JoomSEF 4.2.3 I had some trouble trying to post at first but we did purchase both the extension and the virtuemart plugin for it.