Hi,

Looks like Google's been fiddling with its code again because I found my RTM side-bar stopped appearing in Gmail about 10 days ago.

After heaps of testing (removing other add-ons including Better Email), I found something that consistently works for me.

* Tools --> Clear Private Data --> Select "Cache" -->
Press "Clear Private Data Now"
* Close Firefox
* Run Firefox
* Open Gmail
* RTM sidebar appears again

The quick keyboard way of doing this is:
* CTRL + Shift + Enter
* Press Enter (to "Clear Private Data Now" including the cache)
* CTRL +W (to close Firefox)
* Open Firefox (I have a keyboard shortcut for this)
* Open Gmail (this is my home page)

If you're still at a loss, report it to Bob, Emily and co at:
http://www.rememberthemilk.com/help/contact/support/?ctx=gmail

Cheers,

Dougal