Thunderbird not able to edit sieve Message Filters

[Peter Bell]

I'm not sure when this problem first occurred - it is many months since 
I last editted a sieve filter.  I am certainly several versions of 
Thunderbird and, probably, a few versions of Dovecot on from when I last 
editted a sieve filter.  However, I do know that I have done so in the past.

I have just built Dovecot 2.2.13 and Pigeonhole 0.4.3, installed and 
running on Slackware 14.1 x64.

I am running an up-to-date version of Thunderbird (31.0) on Arch Linux x64.

The sieve filters are definitely being applied to incoming mail, and 
working perfectly well.

However, when I attempt to edit the Sieve Filters (from Thunderbird 
Tools->Sieve Message Filters...), the Sieve Filters tab is displayed, 
but not populated (eg, the Server Sieve Capabilities are not displayed, 
and there is an endless 'hourglass' displayed in the main mailfilters pane.

Does anyone recognise the symptoms and can advise how to resolve the 
problem, or suggest what logs I should examine/post in order to identify 
the cause?

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Peter Bell                                Mob: +63 (0) 9287 340 343
Tagum City, Philippines.                  Tel: +63 (0) 84 216 9037
email/msn: peter at bellfamily.org.uk        Tel: +63 (0) 84 308 0002