A client had an issue today with user profile imports being “stuck”.  In one instance (the production instance) the profile import was stuck actually performing the import, in the non-production instance it was stuck on “Enumerating”.  Found a great article by Henrik Andersson to fix the issue.  Here is what he posted as the fix:

Open the registry editor.

Browse to “HKEY_LOCAL_MACHINESOFTWAREMicrosoftOffice Server12.0SearchApplications”.

Here you will find a key for each SSP in the farm. Drill down to "GatherProfileImportContentSources" (which is the Full Import) and check the key “CrawlNumberInProgress”. If it´s not “0xffffffff” then the number displayed corresponds to a key under the branch “HKEY_LOCAL_MACHINESOFTWAREMicrosoftOffice Server12.0SearchApplicationsGatherProfileImportCrawls”.

I changed the number in the key “CrawlNumberInProgress” to “0xffffffff” and then restarted the “Office SharePoint Server Search” service for the settings to be applied.