When clicking on manage tags, I get this error:

Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 786450 bytes) in /private/private/private/web/content/system/db/db.mysql.php on line 385

only thing i’ve done so far is harvest a custom field (1000 entries).  I now have 9554 tags

Did I over tax the system?

I’m hoping that you’re on a version of Tag older than 2.0.9. Is that the case?

mk