I have 3.6 installed and when I click on the forgotten password link the following error is displayed:
 
"Notice: Use of undefined constant PRODUCTS_TITLE - assumed 'PRODUCTS_TITLE' in /home/eurolux/public_html/blocks/block_search.php on line 19"
 
If anyone can assist I would be very grateful.
 
In all other respects the installation appears to be fine.
 
Michael.

Michael,
The definition is in messages/xx/cart_messages.php so its not a case of a missing definition.
 
However you say you are clicking on the "Forgotten Password Link".
This appears in the "User Login" block. Is this the block you are using?