Can't create a feed.

This is a strange one.

I installed FeedAPI 6.x-1.3 a few days ago. I added several feeds using FeedAPI: Quick create Feed. No problems. The feeds were entered into the 'feedapi' table, the feeds downloaded fine, I was impressed.

I started doing some module development using FeedAPI as a dependency. That was all going well too. I added a bunch of tests feeds, removed them, added them back, etc. Normal dev stuff. Bulletproof.

However, after deleting all the test feeds for the umteenth time, I suddenly found that I couldn't enter a feed anymore. Nothing was getting written to the 'feedapi' table. There were also no error messages.

I figured I must have broken something so I unistalled/removed my module. Still nothing. I uninstalled/removed FeedAPI and its associated dependencies. Still nothing. I downloaded and installed the development API, 6.x-1.3-dev. Then I got an error message:

* Could not retrieve title from feed.

This was from the same RSS feeds I'd successfully added and removed a couple of dozen times before.

I uninstalled 6.x-1.3-dev and downloaded/installed 6.x-1.3 again. Now I get a new error message when I try to add a new Quick Feed:

* warning: Invalid argument supplied for foreach() in /web/htdocs/devel/drupal-6.4/sites/all/modules/feedapi/feedapi.module on line 1279.
* Could not retrieve title from feed.

I uninstalled/removed/reinstalled 6.x-1.3 a couple of more times. No difference. I continue to get those same two error messages.

Beats the heck out of me. The only symptom I noticed is that FeedAPI doesn't clean up all its variables when it's uninstalled. However, I deleted those through Debug, cleaned the cache and reinstalled but it made no difference.