When reporting bugs, please add the usual details: SMW version, MW version, URL, reproducible? Otherwise it is not possible to fix your problem.

jorisaerts wrote:

MediaWiki 1.13.0 (r39942)
PHP 5.2.2-0.dotdeb.1 (apache2handler)
MySQL 5.0.32-Debian_7etch5-log

Semantic MediaWiki (Version 1.2.1)
Semantic Forms (Version 1.2.9)

It's on a private wiki so I can't add a url.
It occures with every page and property I try.

jorisaerts wrote:

It appears it only happens on custom namespaces. When using the same form for User:Foo it works, while Stuff:Bar doesn't.

There have been cases where semantic information in SMW 1.2.1 was stored wrongly, and this can well be the reason for your problem. Update to SMW 1.2.2 (simply drop in the new files). To fix you database, try running the following maintenance scripts (see SMW/maintenance/README for details):

SMW_refreshData.php -vftp
SMW_refreshData.php -v

If your wiki is larger than 2000 pages, use parameters -s and -e to apply the script to smaller chunks of pages at a time (PHP may leak memory on long runs). Your wiki's data will be rebuild afte rcompleting these scripts. Touch LocaLSettings.php to clear all caches afterwards.

It just strikes me that there might be another reason: SMW has a list of namespaces for which semantic data is accepted *at all*. If you added a custom namespace, then maybe you did not enable semantics for this namespace. Add something like

$smwgNamespacesWithSemanticLinks[YOUR_NS_NUMBER] = true;

to your LocalSettings. Updating to SMW 1.2.2 then is probably not needed (I think the main causes of problems have ben fixed in SMW 1.2.1 already, 1.2.2 was rather minor). But you still may have to run

SMW_refreshData.php -v

once to read in your Stuff: pages (note that the two runs with parameters as above are not needed then).

This appears to be a very likely cause for the problem and I close this bug for now. Reopen it if needed.

jorisaerts wrote:

Thank you very much. that solved the problem. Sorry for bothering you.