gnus registry issues

[Prateek Sadhukhan]

Hi,

Versions:
GNU Emacs 24.3.1
Gnus v5.13

I have configured registry with the following:

,----
| (require 'gnus-registry)
| (setq gnus-registry-max-entries 500000)
| (gnus-registry-initialize)
| (setq gnus-registry-track-extra '(sender subject))
| (defalias 'gnus-user-format-function-M 'gnus-registry-article-marks-to-chars)
`----
I also modified the summaryline to include %uM

However when I try to set a Mark on a mail (nnimap) I always get
,----
| Removing mark nil with message ID 
<8AC5BD2CFB39B248AFD9196071C52E2C01672F8C@xmb-aln-x03.cisco.com>, resulting in 
nil
| Marks are nil
`----

No marks are set. 

Thanks,
Prateek