Impossible Empty Keyword

On Friday night, we upgraded our imapd server's hardware & OS to Solaris 
10 from Solaris 8.  Both machines are running UW imap 2007f.  We 
recompiled it on the new machine.

As our users come back, we're seeing some log messages

Jan 27 10:38:40 HHHHH imapd[8566]: [ID 273760 mail.alert] Fatal error 
user=XXXXXX host=XXXXXXX.AI.SRI.COM [NNN.NNN.NNN.NNN] 
mbx=/path/to/a/mail/folder: impossible empty keyword
Jan 27 10:38:40 HHHHH imapd[8566]: [ID 746981 mail.alert] IMAP toolkit 
crash: impossible empty keyword

I don't yet know how many mail folders are impacted by this.  I don't 
know what triggers these errors (no one has complained yet)

I see this error message in mix.c (our mail is stored as mix mail 
folders), but I haven't yet looked to see what the code is doing (but I 
will).
If someone else has run into this issue and can shed any light, please 
let me know.

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