Could a content type be corrupt? I just update a site from Drupal 7.14 to Drupal 7.15 and made some other modules updates.

One of the content I have created in the site is Inmuebles

The site have around 200 nodes of the Inmueble type. All of them are shown fine. But if I tried to edit them I get a blank page (nothing at all).

I tried to Edit the content type Inmueble itself and I get a blank page.

I tried to Manage the Fields and I get a blank page.

I have no problems with other content types, just with this one.

I guess this content type has a mis-configuration but I see no way to fix it if I can't access to modify it.

If I delete the content type because I will delete the nodes as well, then I can't do that.

What can I do? I have Drush installed, just in case it helps to fix this.

UPDATE

Found the problem (but not the source of the problem)
It was a problem of memory size. I had to set the memory size to 512 to get the content type loaded. But this is not normal anyway. The page takes 1 minute to load... and why does this content type need this much memory to work fine. How can I fix this?

I enabled  Display query log , Display memory usage and Display memory usage 
Now if I edit a node I get this summary report:


  Executed 731 queries in 555.96 ms. Queries exceeding 5 ms are
  highlighted. Page execution time was 3058.65 ms. Memory used at:
  devel_boot()=2.08 MB, devel_shutdown()=135.13 MB, PHP peak=137.25 MB.
You can export all the nodes of content type "Inmuebles" with the drush command 

drush -u 1 ne-export --type=inmuebles


Then maybe try deleting the content type and creating it again.

Although it doesnt make sense for a content type to just get corrupt, maybe if you check your error reports or apache log you will get a better look.