I am using the most recent 6 core, though I've had this problem on previous versions

If I try to change 'Authored by' for some nodes I get errors as soon as I type a character.
'An error ocurred in .../user/autocomplete - but no error number and nothing appears in my logs

but the results are tempermental

1) On firefox or IE - Acquia Slate theme - when the error occurs, no dropdown box of choices appears, or sometimes the bottom of the choices box is truncated at the the beginning of the next form field, or only has the first of a partial list of available options and no scrollbar.
2) On IE - Garland - no error occurs, but usually the dropdown only has partial results and no scrollbar.

This usually happens for the author field, but also sometimes happens for other user/autocomplete fields, and sometimes for location autocomplete fields.

I dont not have base_url set in my settings file.

Im not seeing any other issues with my system that can't be explained, and Im not sure what other information to provide here, but if someone asks i can check.

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Status: Active » Closed (outdated)

Automatically closed because Drupal 6 is no longer supported. If the issue verifiably applies to later versions, please reopen with details and update the version.