[TYPO3-dev] Can't change type of page in BE

[Olle Haerstedt]

Hi!

I managed to break something when I wanted to introduce a new page type
and now I can't fix it. There's no error messages in the apache log,
I've cleared the cache. Also no messages in the TYPO3 BE log.

What I've done is extending the pages table with a new field,
applicationid. I've also changed ext_tables.php to be able to choose a new page 
type. I've tried to revert to an older version of my extension without this problem
being fixed.

The symptom is this: When I edit an old page or create a new one,
when I try to change page type to whatever I get this popup:
 
"This change will affect which fields are available in the form.
Would you like to save now in order to refresh the display?"

It doesn't matter what I choose: when the display is refreshed, the page type is
the old page type. So this field is not being saved. I can save and change other
fields, though.

Does anybody know why this is? Where to look for errors? Is there any log to
hint about the problem?

Regards
Olle