Have used Diigo for a long time, but recently haven't been able to sign in via, or indeed make use of, the toolbar. The sign-in button on the toolbar just sends me to which doesn't load, thereby rendering the toolbar useless. It's probably a conflict with another extension, as it works fine in a clean profile. Am currently disabling extensions one-by-one (in last installed date order) to try and pinpoint the problem, but I list those installed below. Any ideas on where the conflict might lie? I don't suppose it could be a clash with a recent firefox update might it? - 2.0.0.17 was fine, but I recently updated to 2.0.0.18.

Diigo v 3.1.5.7, Firefox 2.0.0.18, Ubuntu Hardy Heron.

User Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.18) Gecko/20081113 Ubuntu/8.04 (hardy) Firefox/2.0.0.18
Extensions (enabled: 53, disabled: 10):

* Adblock Plus 0.7.5.5
* Add Bookmark Here 0.5.8 [disabled]
* Add to Netvibes 0.8.1
* Add to Search Bar 1.7
* All-in-One Sidebar 0.7.6
* BlogRovR 1.1.786
* British English Dictionary 1.19
* Clipmarks 3.5.0 [disabled]
* del.icio.us 1.2 [disabled]
* DictionarySearch 3.0.0
* Diigo Bookmarks and Web Annotations 3.1.5.7
* Download Statusbar 0.9.6.3
* DownloadHelper 3.0.4
* Enhanced Bookmark Search 0.1.4.04.1
* Enhanced History Manager 0.5.8.05.1
* Extended Statusbar 1.5.3
* Extension Manager Extended 2.7.1
* Facebook Toolbar 1.2.1 [disabled]
* Firefox Universal Uploader (fireuploader) 0.3.5
* FirefoxView 0.31.2
* FireFTP 0.97.3
* FlashGot 1.1.4
* Flat Bookmark Editing 0.8.1
* Flickr Sidebar 0.2 [disabled]
* FoxLingo 2.3.1
* FoxyTunes 3.0.4.1
* Greasemonkey 0.8.20080609.0
* IE Tab 1.3.3.20070528
* IE View 1.3.8 [disabled]
* iMacros for Firefox 6.0.7.6
* InfoLister 0.10
* Jeteye 1.6.6.20080918113710
* LastTab 2.1.1
* MediaPlayerConnectivity 0.8.3 [disabled]
* Menu Editor 1.2.6 [disabled]
* Open link in... 1.4.1
* Open Profile Folder 1.1.5
* OpenBook 1.3.4.1
* Paste and Go 2 0.8
* Print Preview 0.7.1.4
* ProfileSwitcher 0.3.4.1 [disabled]
* QuickNote 0.6.0.3
* ReminderFox 1.8
* Restart Firefox 0.3
* Sage 1.3.10
* Save Image in Folder 1.2.2
* Save to Vodpod 0.5
* ScrapBook 1.3.3.7
* Screen grab! 0.95
* ScribeFire 3.1.4
* Searchbar Autosizer 1.3.7
* Session Manager 0.6.2.5
* Shareaholic 1.4.1
* Shazou 3.0b4
* Speed Dial 0.7.2 [disabled]
* StumbleUpon 3.26
* Tabbrowser Preferences 1.3.1.1
* TinyUrl Creator 1.0.5
* TorrentBar 0.9.1.8
* Twitbin 1.5.1
* Ubuntu Firefox Modifications 0.5
* Wikalong 0.82
* YouPlayer 0.9.8

Themes (2):

* Firefox (default) 2.0
* Walnut for Firefox 1.8.34 [selected]

Plugins (9):

* DivX Browser Plug-In
* GCJ Web Browser Plugin 0.96.1
* gecko-mediaplayer 0.6.0
* Helix DNA Plugin: RealPlayer G2 Plug-In Compatible
* Java(TM) Plug-in 1.6.0_07-b06
* QuickTime Plug-in 6.0 / 7
* RealPlayer 9
* Shockwave Flash
* Windows Media Player Plug-in

I should have said earlier - the same problem occurs with the latest version of the toolbar. I've established it's nothing to do with the firefox update, so it's either a clash with one or more extensions, or my firefox profile is corrupt.

Thanks for your suggestions so far guys!

Solved!

I must have removed the 'server' options from the diigo toolbar when customising my toolbars. Server options are 1) www 2) preview 3) cn. I had an inkling it might be this, as I had managed to "grab" them one day when trying to edit my toolbars, when firefox crashed. Had been trying to work out what they were for, and had fiddled with the settings, changing from www to cn. Anyway, putting it back in the Diigo toolbar and changing it back to www seems to have solved the problem!

Thanks again!