Settings changes under Edit Field do not stick

Hello,

With the latest release, several settings in the "Edit Field" section of admin/build/feeds revert back to their defaults upon save. The message "Your changes have been saved" does appear, but the selections are wiped out.
These are the ones I've found so far:

• Under HTTP fetcher, checking either checkbox
• Under Node processor -> Settings, changing any of the select menus or checking the checkbox
• Under Node processor -> Mappings, adding any mappings reverts back to an empty table (or the default table if using the Feeds Defaults module)

Let me know if you need any other information to diagnose this problem.